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Bug#870484: linux-image-4.9.0-3-amd64: nf_conntrack_ftp does not detect passive data connection as related



Package: src:linux
Version: 4.9.30-2+deb9u2
Severity: normal

Hello, there.

I just encounter a situation which seems to indicate that
nf_conntrack_ftp does not work as it should. The affected server has
the following iptables rules regarding FTP:
Chain INPUT (policy DROP 4 packets, 208 bytes)
 pkts bytes target     prot opt
in     out     source               destination
   87 13850 ACCEPT     all  
--  lo     *       0.0.0.0/0            0.0.0.0/0            /* loopbac
k@localhost */
    1    44 ACCEPT     tcp  
--  ens3   *       0.0.0.0/0            0.0.0.0/0            tcp dpt:21
flags:0x17/0x02 limit: avg 5/min burst 50 recent: SET name: FTP side:
source mask: 255.255.255.255
    0     0 LOGDROP    tcp  
--  ens3   *       0.0.0.0/0            0.0.0.0/0            tcp dpt:21
flags:0x17/0x02 recent: UPDATE seconds: 60 hit_count: 6 TTL-Match name:
FTP side: source mask: 255.255.255.255
   17   769 ACCEPT     tcp  
--  ens3   *       0.0.0.0/0            0.0.0.0/0            tcp dpt:21
    0     0 ACCEPT     tcp  
--  ens3   *       0.0.0.0/0            0.0.0.0/0            tcp
dpts:50000:50500 ctstate RELATED,ESTABLISHED
[…]
Chain OUTPUT (policy DROP 0 packets, 0 bytes)
 pkts bytes target     prot opt
in     out     source               destination
  466 75053 ACCEPT     all  
--  *      lo      0.0.0.0/0            0.0.0.0/0            /* loopbac
k@localhost */
   14  1184 ACCEPT     tcp  
--  *      ens3    0.0.0.0/0            0.0.0.0/0            tcp spt:21
    0     0 ACCEPT     tcp  
--  *      ens3    0.0.0.0/0            0.0.0.0/0            tcp
spts:50000:50500 ctstate RELATED,ESTABLISHED
[…]

As you can see, iptables is configured to let passive FTP connections
pass, on the same port range than the one configured on the FTP
service:
root@pern /h/david {⌗0/⬓2}[0]꩜# cat /etc/pure-
ftpd/conf/PassivePortRange 
50000 50500

Still, the passive FTP connection can't be established, as it freezes
when the client tries to open the passive data connection:
13:55:36.066536 IP client.59494 > server.ftp: Flags [S], seq
2083620944, win 32120, options [mss 1460], length
0                       
13:55:36.066589 IP server.ftp > client.59494: Flags [S.], seq
2534440145, ack 2083620945, win 29200, options [mss 1460], length 0
13:55:36.101446 IP client.59494 > server.ftp: Flags [.], ack 1, win
32120, length 0                           
13:55:41.111237 IP server.ftp > client.59494: Flags [P.], seq 1:320,
ack 1, win 29200, length 319: FTP: 220---------- Welcome to Pure-FTPd
[privsep] [TLS] ----------
13:55:41.144917 IP client.59494 > server.ftp: Flags [.], ack 320, win
31801, length 0
13:55:41.983515 IP client.59494 > server.ftp: Flags [P.], seq 1:11, ack
320, win 32120, length 10: FTP: AUTH TLS
13:55:41.983551 IP server.ftp > client.59494: Flags [.], ack 11, win
29200, length
0                                                         
13:55:41.983654 IP server.ftp > client.59494: Flags [P.], seq 320:365,
ack 11, win 29200, length 45: FTP: 500 This security scheme is not
implemented
13:55:42.017240 IP client.59494 > server.ftp: Flags [.], ack 365, win
32075, length 0                                                        
13:55:42.743558 IP client.59494 > server.ftp: Flags [P.], seq 11:21,
ack 365, win 32120, length 10: FTP: AUTH
SSL                            
13:55:42.743750 IP server.ftp > client.59494: Flags [P.], seq 365:410,
ack 21, win 29200, length 45: FTP: 500 This security scheme is not
implemented
13:55:42.777386 IP client.59494 > server.ftp: Flags [.], ack 410, win
32075, length 0                                                        
13:55:43.503046 IP client.59494 > server.ftp: Flags [P.], seq 21:36,
ack 410, win 32120, length 15: FTP: USER **removed for
security**       
13:55:43.503210 IP server.ftp > client.59494: Flags [P.], seq 410:451,
ack 36, win 29200, length 41: FTP: 331 User **removed for security**
OK. Password required
13:55:43.536807 IP client.59494 > server.ftp: Flags [.], ack 451, win
32079, length 0
13:55:44.303051 IP client.59494 > server.ftp: Flags [P.], seq 36:63,
ack 451, win 32120, length 27: FTP: PASS **removed for security**
13:55:44.328143 IP server.ftp > client.59494: Flags [P.], seq 451:483,
ack 63, win 29200, length 32: FTP: 230 OK. Current directory is /
13:55:44.361804 IP client.59494 > server.ftp: Flags [.], ack 483, win
32088, length 0                                  
13:55:45.103442 IP client.59494 > server.ftp: Flags [P.], seq 63:69,
ack 483, win 32120, length 6: FTP: SYST           
13:55:45.103606 IP server.ftp > client.59494: Flags [P.], seq 483:502,
ack 69, win 29200, length 19: FTP: 215 UNIX Type: L8
13:55:45.137252 IP client.59494 > server.ftp: Flags [.], ack 502, win
32101, length 0                                  
13:55:45.983146 IP client.59494 > server.ftp: Flags [P.], seq 69:75,
ack 502, win 32120, length 6: FTP: FEAT           
13:55:45.983254 IP server.ftp > client.59494: Flags [P.], seq 502:742,
ack 75, win 29200, length 240: FTP: 211-Extensions supported:
13:55:46.016878 IP client.59494 > server.ftp: Flags [.], ack 742, win
31880, length 0                                  
13:55:46.783712 IP client.59494 > server.ftp: Flags [P.], seq 75:89,
ack 742, win 32120, length 14: FTP: OPTS UTF8 ON
13:55:46.783902 IP server.ftp > client.59494: Flags [P.], seq 742:765,
ack 89, win 29200, length 23: FTP: 200 OK, UTF-8 enabled
13:55:46.817570 IP client.59494 > server.ftp: Flags [.], ack 765, win
32097, length 0
13:55:47.544469 IP client.59494 > server.ftp: Flags [P.], seq 89:94,
ack 765, win 32120, length 5: FTP: PWD
13:55:47.544640 IP server.ftp > client.59494: Flags [P.], seq 765:799,
ack 94, win 29200, length 34: FTP: 257 "/" is your current location
13:55:47.578287 IP client.59494 > server.ftp: Flags [.], ack 799, win
32086, length 0
13:55:48.342997 IP client.59494 > server.ftp: Flags [P.], seq 94:102,
ack 799, win 32120, length 8: FTP: TYPE I
13:55:48.343143 IP server.ftp > client.59494: Flags [P.], seq 799:829,
ack 102, win 29200, length 30: FTP: 200 TYPE is now 8-bit binary
13:55:48.376858 IP client.59494 > server.ftp: Flags [.], ack 829, win
32090, length 0
13:55:49.143326 IP client.59494 > server.ftp: Flags [P.], seq 102:108,
ack 829, win 32120, length 6: FTP: PASV
13:55:49.143517 IP server.ftp > client.59494: Flags [P.], seq 829:879,
ack 108, win 29200, length 50: FTP: 227 Entering Passive Mode
(**removed for security**,196,84)
13:55:49.177260 IP client.59494 > server.ftp: Flags [.], ack 879, win
32070, length 0
13:55:49.943101 IP client.59494 > server.ftp: Flags [P.], seq 108:114,
ack 879, win 32120, length 6: FTP: MLSD
13:55:49.943277 IP client.55391 > server.50260: Flags [S], seq
1498334446, win 8192, options [mss 1460,nop,wscale 2,nop,nop,sackOK],
length 0
13:55:49.984867 IP server.ftp > client.59494: Flags [.], ack 114, win
29200, length 0
13:55:52.940748 IP client.55391 > server.50260: Flags [S], seq
1498334446, win 8192, options [mss 1460,nop,wscale 2,nop,nop,sackOK],
length 0
13:55:57.065945 IP client.55391 > server.50260: Flags [S], seq
1814879207, win 8192, options [mss 1460,nop,wscale 2,nop,nop,sackOK],
length 0
13:56:00.063063 IP client.55391 > server.50260: Flags [S], seq
1814879207, win 8192, options [mss 1460,nop,wscale 2,nop,nop,sackOK],
length 0
13:56:05.423245 IP client.55391 > server.50260: Flags [S], seq
4001186743, win 8192, options [mss 1460,nop,wscale 2,nop,nop,sackOK],
length 0
13:56:08.425764 IP client.55391 > server.50260: Flags [S], seq
4001186743, win 8192, options [mss 1460,nop,wscale 2,nop,nop,sackOK],
length 0

During the time the client tries to open the passive data connection,
the conntrack table only contains the control connection:
root@pern /h/david {⌗0/⬓2}[0]꩜# conntrack -L -s
88.202.77.84                       
tcp      6 431989 ESTABLISHED src=client dst=server sport=59494
dport=21 src=server dst=client sport=21 dport=59494 [ASSURED] mark=0
use=1                                  
conntrack v1.4.4 (conntrack-tools): 1 flow entries have been
shown.                             

The FTP counters above were retrieved after the FTP connection attempt;
as you can see, iptables does not let them pass. Because the conntrack
does not contain the passive data connection, it is manifestly because
the nf_conntrack_ftp does not identify the passive data connection
attempts as being related to the already established control
connection. Should nf_conntrack_ftp do its job, there will be an entry
in the conntrack, even if iptables were misconfigured and did not let
these packets pass. I also strongly suspect a nf_conntrack_ftp failure
as:
    * the client tries to connect to the passive port the server gave,
so it's not a client error; anyway, I tried 2 clients (packages
filezilla and ftp), so I'm pretty sure the client is not the problem;
    * the problem remains if I use -m state --state ESTABLISHED,RELATED
for the passive data connection; I might add that it was what I did
under Jessie and Wheezy and there was no problem.

If you need more data to process this report, I will provide them in
this report, as long as I can anonymise them enough; if I can't, I'll
send them as a private message to the Debian maintainer requesting
them.

Regards.

-- Package-specific info:
** Version:
Linux version 4.9.0-3-amd64 (debian-kernel@lists.debian.org) (gcc
version 6.3.0 20170516 (Debian 6.3.0-18) ) #1 SMP Debian 4.9.30-
2+deb9u2 (2017-06-26)

** Command line:
BOOT_IMAGE=/boot/vmlinuz-4.9.0-3-amd64 root=UUID=9abb590f-8a5e-496f-
ad2a-2c877415bdc5 ro console=ttyS0

** Not tainted

** Kernel log:
Unable to read kernel log; any relevant messages should be attached

** Model information
sys_vendor: OpenStack Foundation
product_name: OpenStack Nova
product_version: 2014.2.4
chassis_vendor: QEMU
chassis_version: pc-i440fx-vivid
bios_vendor: SeaBIOS
bios_version: 2:1.10.2-6e899082

** Loaded modules:
nfnetlink_queue
nfnetlink_log
nfnetlink
bluetooth
rfkill
ip6table_mangle
iptable_mangle
binfmt_misc
xt_connlimit
ts_bm
xt_string
nf_conntrack_ipv6
nf_defrag_ipv6
nf_conntrack_ipv4
nf_defrag_ipv4
xt_conntrack
xt_hashlimit
xt_tcpudp
xt_recent
xt_comment
nf_log_ipv6
ip6table_filter
ip6_tables
nf_log_ipv4
nf_log_common
xt_LOG
xt_limit
iptable_filter
kvm_intel
kvm
ppdev
parport_pc
parport
sg
irqbypass
hid_generic
crct10dif_pclmul
crc32_pclmul
ghash_clmulni_intel
usbhid
hid
cirrus
ttm
drm_kms_helper
virtio_balloon
joydev
evdev
drm
serio_raw
acpi_cpufreq
button
pcspkr
nf_conntrack_ftp
nf_conntrack
ip_tables
x_tables
autofs4
ext4
crc16
jbd2
crc32c_generic
fscrypto
ecb
mbcache
sd_mod
ata_generic
virtio_scsi
virtio_net
crc32c_intel
uhci_hcd
ata_piix
ehci_hcd
libata
aesni_intel
aes_x86_64
glue_helper
lrw
gf128mul
ablk_helper
usbcore
cryptd
usb_common
psmouse
virtio_pci
virtio_ring
virtio
scsi_mod
i2c_piix4
floppy

** Network interface configuration:

source /etc/network/interfaces.d/*

auto lo
iface lo inet loopback

allow-hotplug ens4
iface ens4 inet dhcp

iface ens3 inet6 static
    address **removed for security**
    netmask 128
    post-up /sbin/ip -6 route add 2001:41d0:302:1100::1 dev ens3
    post-up /sbin/ip -6 route add default via 2001:41d0:302:1100::1 dev
ens3
    pre-down /sbin/ip -6 route del default via 2001:41d0:302:1100::1
dev ens3
    pre-down /sbin/ip -6 route del 2001:41d0:302:1100::1 dev ens3

** Network status:
*** IP interfaces and addresses:
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
group default qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast
state UP group default qlen 1000
    link/ether fa:16:3e:ab:8b:78 brd ff:ff:ff:ff:ff:ff
    inet **removed for security** brd **removed for security** scope
global ens3
       valid_lft forever preferred_lft forever
    inet6 **renoved for security** scope global 
       valid_lft forever preferred_lft forever
    inet6 fe80::f816:3eff:feab:8b78/64 scope link 
       valid_lft forever preferred_lft forever

*** Device statistics:
Inter-
|   Receive                                                |  Transmit
 face |bytes    packets errs drop fifo frame compressed
multicast|bytes    packets errs drop fifo colls carrier compressed
    lo:  768873    5094    0    0    0     0          0         0   768
873    5094    0    0    0     0       0          0
  ens3:
2572670    4306    0    0    0     0          0         0  1142527    4
565    0    0    0     0       0          0

*** Protocol statistics:
Ip:
    Forwarding: 2
    7432 total packets received
    4 with invalid addresses
    0 forwarded
    0 incoming packets discarded
    7413 incoming packets delivered
    7349 requests sent out
    32 outgoing packets dropped
Icmp:
    678 ICMP messages received
    0 input ICMP message failed
    ICMP input histogram:
        destination unreachable: 325
        echo requests: 353
    678 ICMP messages sent
    0 ICMP messages failed
    ICMP output histogram:
        destination unreachable: 325
        echo replies: 353
IcmpMsg:
        InType3: 325
        InType8: 353
        OutType0: 353
        OutType3: 325
Tcp:
    521 active connection openings
    240 passive connection openings
    0 failed connection attempts
    4 connection resets received
    1 connections established
    5209 segments received
    5625 segments sent out
    41 segments retransmitted
    0 bad segments received
    35 resets sent
Udp:
    2866 packets received
    325 packets to unknown port received
    0 packet receive errors
    3239 packets sent
    0 receive buffer errors
    0 send buffer errors
UdpLite:
TcpExt:
    482 TCP sockets finished time wait in fast timer
    33 delayed acks sent
    Quick ack mode was activated 8 times
    15 packets directly queued to recvmsg prequeue
    TCPDirectCopyFromPrequeue: 46534
    908 packet headers predicted
    5 packet headers predicted and directly queued to user
    1483 acknowledgments not containing data payload received
    709 predicted acknowledgments
    TCPSackRecovery: 12
    TCPDSACKUndo: 3
    1 congestion windows recovered without slow start after partial ack
    TCPLostRetransmit: 2
    TCPSackFailures: 1
    25 fast retransmits
    3 forward retransmits
    2 retransmits in slow start
    TCPTimeouts: 1
    TCPLossProbes: 9
    TCPSackRecoveryFail: 1
    TCPDSACKOldSent: 8
    TCPDSACKRecv: 6
    14 connections reset due to unexpected data
    TCPSpuriousRTOs: 1
    TCPSackMerged: 10
    TCPSackShiftFallback: 19
    IPReversePathFilter: 1
    TCPRcvCoalesce: 113
    TCPOFOQueue: 13
    TCPOrigDataSent: 2835
IpExt:
    InOctets: 1297927
    OutOctets: 1070535
    InNoECTPkts: 7470


** PCI devices:
00:00.0 Host bridge [0600]: Intel Corporation 440FX - 82441FX PMC
[Natoma] [8086:1237] (rev 02)
	Subsystem: Red Hat, Inc Qemu virtual machine [1af4:1100]
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0

00:01.0 ISA bridge [0601]: Intel Corporation 82371SB PIIX3 ISA
[Natoma/Triton II] [8086:7000]
	Subsystem: Red Hat, Inc Qemu virtual machine [1af4:1100]
	Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium
>TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-

00:01.1 IDE interface [0101]: Intel Corporation 82371SB PIIX3 IDE
[Natoma/Triton II] [8086:7010] (prog-if 80 [Master])
	Subsystem: Red Hat, Inc Qemu virtual machine [1af4:1100]
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium
>TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Region 0: [virtual] Memory at 000001f0 (32-bit, non-
prefetchable) [size=8]
	Region 1: [virtual] Memory at 000003f0 (type 3, non-
prefetchable)
	Region 2: [virtual] Memory at 00000170 (32-bit, non-
prefetchable) [size=8]
	Region 3: [virtual] Memory at 00000370 (type 3, non-
prefetchable)
	Region 4: I/O ports at c0a0 [size=16]
	Kernel driver in use: ata_piix
	Kernel modules: ata_piix, ata_generic

00:01.2 USB controller [0c03]: Intel Corporation 82371SB PIIX3 USB
[Natoma/Triton II] [8086:7020] (rev 01) (prog-if 00 [UHCI])
	Subsystem: Red Hat, Inc QEMU Virtual Machine [1af4:1100]
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin D routed to IRQ 11
	Region 4: I/O ports at c040 [size=32]
	Kernel driver in use: uhci_hcd
	Kernel modules: uhci_hcd

00:01.3 Bridge [0680]: Intel Corporation 82371AB/EB/MB PIIX4 ACPI
[8086:7113] (rev 03)
	Subsystem: Red Hat, Inc Qemu virtual machine [1af4:1100]
	Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium
>TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Interrupt: pin A routed to IRQ 9
	Kernel driver in use: piix4_smbus
	Kernel modules: i2c_piix4

00:02.0 VGA compatible controller [0300]: Cirrus Logic GD 5446
[1013:00b8] (prog-if 00 [VGA controller])
	Subsystem: Red Hat, Inc QEMU Virtual Machine [1af4:1100]
	Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
	Region 0: Memory at fc000000 (32-bit, prefetchable) [size=32M]
	Region 1: Memory at febd0000 (32-bit, non-prefetchable)
[size=4K]
	Expansion ROM at 000c0000 [disabled] [size=128K]
	Kernel driver in use: cirrus
	Kernel modules: cirrusfb, cirrus

00:03.0 Ethernet controller [0200]: Red Hat, Inc Virtio network device
[1af4:1000]
	Subsystem: Red Hat, Inc Virtio network device [1af4:0001]
	Physical Slot: 3
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR+ FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 10
	Region 0: I/O ports at c060 [size=32]
	Region 1: Memory at febd1000 (32-bit, non-prefetchable)
[size=4K]
	Expansion ROM at feb80000 [disabled] [size=256K]
	Capabilities: [40] MSI-X: Enable+ Count=3 Masked-
		Vector table: BAR=1 offset=00000000
		PBA: BAR=1 offset=00000800
	Kernel driver in use: virtio-pci
	Kernel modules: virtio_pci

00:04.0 SCSI storage controller [0100]: Red Hat, Inc Virtio SCSI
[1af4:1004]
	Subsystem: Red Hat, Inc Virtio SCSI [1af4:0008]
	Physical Slot: 4
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR+ FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 11
	Region 0: I/O ports at c000 [size=64]
	Region 1: Memory at febd2000 (32-bit, non-prefetchable)
[size=4K]
	Capabilities: [40] MSI-X: Enable+ Count=4 Masked-
		Vector table: BAR=1 offset=00000000
		PBA: BAR=1 offset=00000800
	Kernel driver in use: virtio-pci
	Kernel modules: virtio_pci

00:05.0 Unclassified device [00ff]: Red Hat, Inc Virtio memory balloon
[1af4:1002]
	Subsystem: Red Hat, Inc Virtio memory balloon [1af4:0005]
	Physical Slot: 5
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR+ FastB2B- DisINTx-
	Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 10
	Region 0: I/O ports at c080 [size=32]
	Kernel driver in use: virtio-pci
	Kernel modules: virtio_pci


** USB devices:
not available


-- System Information:
Debian Release: 9.1
  APT prefers stable
  APT policy: (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.9.0-3-amd64 (SMP w/4 CPU cores)
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8),
LANGUAGE=fr_FR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages linux-image-4.9.0-3-amd64 depends on:
ii  initramfs-tools [linux-initramfs-tool]  0.130
ii  kmod                                    23-2
ii  linux-base                              4.5

Versions of packages linux-image-4.9.0-3-amd64 recommends:
pn  firmware-linux-free  <none>
pn  irqbalance           <none>

Versions of packages linux-image-4.9.0-3-amd64 suggests:
pn  debian-kernel-handbook  <none>
ii  grub-pc                 2.02~beta3-5
pn  linux-doc-4.9           <none>

Versions of packages linux-image-4.9.0-3-amd64 is related to:
pn  firmware-amd-graphics     <none>
pn  firmware-atheros          <none>
pn  firmware-bnx2             <none>
pn  firmware-bnx2x            <none>
pn  firmware-brcm80211        <none>
pn  firmware-cavium           <none>
pn  firmware-intel-sound      <none>
pn  firmware-intelwimax       <none>
pn  firmware-ipw2x00          <none>
pn  firmware-ivtv             <none>
pn  firmware-iwlwifi          <none>
pn  firmware-libertas         <none>
pn  firmware-linux-nonfree    <none>
pn  firmware-misc-nonfree     <none>
pn  firmware-myricom          <none>
pn  firmware-netxen           <none>
pn  firmware-qlogic           <none>
pn  firmware-realtek          <none>
pn  firmware-samsung          <none>
pn  firmware-siano            <none>
pn  firmware-ti-connectivity  <none>
pn  xen-hypervisor            <none>

-- no debconf information
-- 
David Guyot
Administrateur système / Sysadmin
Europe Camions Interactive / Stockway
Moulin Collot F-88500 Ambacourt
Tél : +33 (0)3 29 30 47 85

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