Debian Security Advisory

DSA-2040-1 squidguard -- buffer overflow

Date Reported:
02 May 2010
Affected Packages:
squidguard
Vulnerable:
Yes
Security database references:
In the Debian bugtracking system: Bug 553319.
In Mitre's CVE dictionary: CVE-2009-3700, CVE-2009-3826.
More information:

It was discovered that in squidguard, a URL redirector/filter/ACL plugin for squid, several problems in src/sgLog.c and src/sgDiv.c allow remote users to either:

  • cause a denial of service, by requesting long URLs containing many slashes; this forces the daemon into emergency mode, where it does not process requests anymore.
  • bypass rules by requesting URLs whose length is close to predefined buffer limits, in this case 2048 for squidguard and 4096 or 8192 for squid (depending on its version).

For the stable distribution (lenny), this problem has been fixed in version 1.2.0-8.4+lenny1.

For the unstable distribution (sid), this problem has been fixed in version 1.2.0-9.

We recommend that you upgrade your squidguard package.

Fixed in:

Debian GNU/Linux 5.0 (lenny)

Source:
http://security.debian.org/pool/updates/main/s/squidguard/squidguard_1.2.0-8.4+lenny1.diff.gz
http://security.debian.org/pool/updates/main/s/squidguard/squidguard_1.2.0.orig.tar.gz
http://security.debian.org/pool/updates/main/s/squidguard/squidguard_1.2.0-8.4+lenny1.dsc
Alpha:
http://security.debian.org/pool/updates/main/s/squidguard/squidguard_1.2.0-8.4+lenny1_alpha.deb
AMD64:
http://security.debian.org/pool/updates/main/s/squidguard/squidguard_1.2.0-8.4+lenny1_amd64.deb
ARM:
http://security.debian.org/pool/updates/main/s/squidguard/squidguard_1.2.0-8.4+lenny1_arm.deb
ARM EABI:
http://security.debian.org/pool/updates/main/s/squidguard/squidguard_1.2.0-8.4+lenny1_armel.deb
HP Precision:
http://security.debian.org/pool/updates/main/s/squidguard/squidguard_1.2.0-8.4+lenny1_hppa.deb
Intel IA-32:
http://security.debian.org/pool/updates/main/s/squidguard/squidguard_1.2.0-8.4+lenny1_i386.deb
Intel IA-64:
http://security.debian.org/pool/updates/main/s/squidguard/squidguard_1.2.0-8.4+lenny1_ia64.deb
Big-endian MIPS:
http://security.debian.org/pool/updates/main/s/squidguard/squidguard_1.2.0-8.4+lenny1_mips.deb
Little-endian MIPS:
http://security.debian.org/pool/updates/main/s/squidguard/squidguard_1.2.0-8.4+lenny1_mipsel.deb
PowerPC:
http://security.debian.org/pool/updates/main/s/squidguard/squidguard_1.2.0-8.4+lenny1_powerpc.deb
IBM S/390:
http://security.debian.org/pool/updates/main/s/squidguard/squidguard_1.2.0-8.4+lenny1_s390.deb
Sun Sparc:
http://security.debian.org/pool/updates/main/s/squidguard/squidguard_1.2.0-8.4+lenny1_sparc.deb

MD5 checksums of the listed files are available in the original advisory.