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Debian Security Advisory DSA-2136-1                  security@debian.org
http://www.debian.org/security/                         Raphael Geissert
December 21, 2010                     http://www.debian.org/security/faq
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Package        : tor
Vulnerability  : buffer overflow
Problem type   : remote
Debian-specific: no
CVE Id         : CVE-2010-1676


Willem Pinckaers discovered that Tor, a tool to enable online anonymity,
does not correctly handle all data read from the network.  By supplying
specially crafted packets a remote attacker can cause Tor to overflow its
heap, crashing the process. Arbitrary code execution has not been
confirmed but there is a potential risk.

In the stable distribution (lenny), this update also includes an update of
the IP address for the Tor directory authority gabelmoo and addresses
a weakness in the package's postinst maintainer script.


For the stable distribution (lenny) this problem has been fixed in
version 0.2.1.26-1~lenny+4.

For the testing distribution (squeeze) and the unstable distribution (sid),
this problem has been fixed in version 0.2.1.26-6.


We recommend that you upgrade your tor packages.

Upgrade instructions
- --------------------

If you are using the apt-get package manager, use the line for
sources.list as given below:

apt-get update
        will update the internal database
apt-get upgrade
        will install corrected packages

You may use an automated update by adding the resources from the
footer to the proper configuration.

-
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For apt-get: deb http://security.debian.org/ stable/updates main
For dpkg-ftp: ftp://security.debian.org/debian-securitydists/stable/updates/main
Mailing list: debian-security-announce@lists.debian.org
Package info: `apt-cache show <pkg>' and http://packages.debian.org/<pkg>
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