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[SECURITY] [DLA 2559-1] busybox security update

Debian LTS Advisory DLA-2559-1                debian-lts@lists.debian.org
https://www.debian.org/lts/security/                      Markus Koschany
February 15, 2021                             https://wiki.debian.org/LTS

Package        : busybox
Version        : 1:1.22.0-19+deb9u1
CVE ID         : CVE-2011-5325 CVE-2015-9261 CVE-2016-2147 CVE-2016-2148 
                 CVE-2017-15873 CVE-2017-16544 CVE-2018-1000517
Debian Bug     : 902724 882258 879732 818497 818499 803097 802702

Busybox, utility programs for small and embedded systems, was affected
by several security vulnerabilities. The Common Vulnerabilities and
Exposures project identifies the following issues.


    A path traversal vulnerability was found in Busybox implementation
    of tar. tar will extract a symlink that points outside of the
    current working directory and then follow that symlink when
    extracting other files. This allows for a directory traversal
    attack when extracting untrusted tarballs.


    When device node or symlink in /dev should be created inside
    2-or-deeper subdirectory (/dev/dir1/dir2.../node), the intermediate
    directories are created with incorrect permissions.


    An integer overflow may occur when processing any variant of a
   "literal run" in the lzo1x_decompress_safe function. Each of these
    three locations is subject to an integer overflow when processing
    zero bytes. This exposes the code that copies literals to memory


    The add_probe function in modutils/modprobe.c in BusyBox allows
    local users to bypass intended restrictions on loading kernel
    modules via a / (slash) character in a module name, as demonstrated
    by an "ifconfig /usbserial up" command or a "mount -t /snd_pcm none
    /" command.


    Integer overflow in the DHCP client (udhcpc) in BusyBox allows
    remote attackers to cause a denial of service (crash) via a
    malformed RFC1035-encoded domain name, which triggers an
    out-of-bounds heap write.


    Heap-based buffer overflow in the DHCP client (udhcpc) in BusyBox
    allows remote attackers to have unspecified impact via vectors
    involving OPTION_6RD parsing.


    The get_next_block function in archival/libarchive
    /decompress_bunzip2.c in BusyBox has an Integer Overflow that may
    lead to a write access violation.


    In the add_match function in libbb/lineedit.c in BusyBox, the tab
    autocomplete feature of the shell, used to get a list of filenames
    in a directory, does not sanitize filenames and results in executing
    any escape sequence in the terminal. This could potentially result
    in code execution, arbitrary file writes, or other attacks.


    BusyBox contains a Buffer Overflow vulnerability in
    Busybox wget that can result in a heap-based buffer overflow.
    This attack appears to be exploitable via network connectivity.


    Unziping a specially crafted zip file results in a computation of an
    invalid pointer and a crash reading an invalid address.

For Debian 9 stretch, these problems have been fixed in version

We recommend that you upgrade your busybox packages.

For the detailed security status of busybox please refer to
its security tracker page at:

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS

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