Re: [SECURITY] [DSA 1430-1] New libnss-ldap packages fix denial of service

[Nicolas Boullis <nicolas.boullis@ecp.fr>]

Hi,

Steve Kemp wrote:
> ------------------------------------------------------------------------
> Debian Security Advisory DSA-1430-1                  security@debian.org
> http://www.debian.org/security/                               Steve Kemp
> December 11, 2007                     http://www.debian.org/security/faq
> ------------------------------------------------------------------------
> 
> Package        : libnss-ldap
> Vulnerability  : denial of service
> Problem type   : local
> Debian-specific: no
> CVE Id(s)      : CVE-2007-5794
> Debian Bug     : 453868
> 
> It was reported that a race condition exists in libnss-ldap, an
> NSS module for using LDAP as a naming service, which could cause
> denial of service attacks when applications use pthreads.
> 
> This problem was spotted in the dovecot IMAP/POP server but
> potentially affects more programs.
> 
> For the stable distribution (etch), this problem has been fixed in version
> 251-7.5etch1.
> 
> For the old stable distribution (sarge), this problem has been fixed in
> version 238-1sarge1.

libnss-ldap 238-1 depends on libkrb while libnss-ldap 238-1sarge1 does
not. That sounds strange. Is it expected? Is it safe to upgrade a
production server?


Cheers,

Nicolas