[Backports-security-announce] Security update for silc-client/silc-toolkit

2009-09-20T13:08:11
ID DEBIAN:BE3473FCFB110170FDD0B41E7943EAE2:D4F23
Type debian
Reporter Debian
Modified 2009-09-20T13:08:11

Description

Jérémy Bobbio uploaded new packages for silc-client/silc-toolkit which fixed the following security problems:

DSA 1879-1

Several vulnerabilities have been discovered in the software suite for the SILC protocol, a network protocol designed to provide end-to-end security for conferencing services. The Common Vulnerabilities and Exposures project identifies the following problems:

An incorrect format string in sscanf() used in the ASN1 encoder to scan an OID value could overwrite a neighbouring variable on the stack as the destination data type is smaller than the source type on 64-bit. On 64-bit architectures this could result in unexpected application behaviour or even code execution in some cases (CVE-2008-7159).

Various format string vulnerabilities when handling parsed SILC messages allow an attacker to execute arbitrary code with the rights of the victim running the SILC client via crafted nick names or channel names containing format strings (CVE-2009-3051).

An incorrect format string in a sscanf() call used in the HTTP server component of silcd could result in overwriting a neighbouring variable on the stack as the destination data type is smaller than the source type on 64-bit. An attacker could exploit this by using crafted Content-Length header values resulting in unexpected application behaviour or even code execution in some cases (CVE-2008-7160).

For the etch-backports distribution the problems have been fixed in version 1.1.4-1+lenny1~bpo40+1 for silc-client and 1.1.7-2+lenny1~bpo40+1 for silc-toolkit.

For the stable distribution (lenny), this problem has been fixed in version 1.1.7-2+lenny1 of silc-toolkit and in version 1.1.4-1+lenny1 of silc-client.

For the testing distribution (squeeze), this problem will be fixed soon.

For the unstable distribution (sid), this problem has been fixed in version 1.1.10-1 of silc-toolkit and version 1.1-2 of silc-client (using libsilc from silc-toolkit since this upload).

We recommend that you upgrade your silc-toolkit/silc-client packages.

Upgrade instructions

If you don't use pinning (http://backports.org/dokuwiki/doku.php?id=instructions) you have to update the package manually via

apt-get -t etch-backport install libsilc-1.1-2 silc irssi-plugin-silc

We recommend to pin the backports repository to 200 so that new versions of installed backports will be installed automatically.

Package: * Pin: release a=etch-backports Pin-Priority: 200

-- Jérémy Bobbio .''. lunar@debian.org : :Ⓐ : # apt-get install anarchism. ' `-