Executive Summary

Titletor security update
NameDSA-2363First vendor Publication2011-12-16
VendorDebianLast vendor Modification2011-12-16
Severity (Vendor) N/ARevision1

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:H/Au:N/C:C/I:C/A:C)
Cvss Base Score7.6Attack RangeNetwork
Cvss Impact Score10Attack ComplexityHigh
Cvss Expoit Score4.9AuthenticationNone Required
Calculate full CVSS 2.0 Vectors scores


It was discovered that Tor, an online privacy tool, incorrectly computes buffer sizes in certain cases involving SOCKS connections. Malicious parties could use this to cause a heap-based buffer overflow, potentially allowing execution of arbitrary code.

In Tor's default configuration this issue can only be triggered by clients that can connect to Tor's socks port, which listens only on localhost by default.

In non-default configurations where Tor's SocksPort listens not only on localhost or where Tor was configured to use another socks server for all of its outgoing connections, Tor is vulnerable to a larger set of malicious parties.

For the oldstable distribution (lenny), this problem has been fixed in version

For the stable distribution (squeeze), this problem has been fixed in version

For the unstable and testing distributions, this problem has been fixed in version

For the experimental distribution, this problem has has fixed in version

We recommend that you upgrade your tor packages.

Please note that the update for stable (squeeze) updates this package from to, a new major release of Tor, as upstream has announced end-of-life for the 0.2.1.x tree for the near future. Please check your Tor runs as expected after the upgrade.

Original Source

Url : http://www.debian.org/security/2011/dsa-2363

CWE : Common Weakness Enumeration

CWE-119Failure to Constrain Operations within the Bounds of a Memory Buffer

CPE : Common Platform Enumeration


OpenVAS Exploits

2012-04-02Name : Fedora Update for tor FEDORA-2011-17248
File : nvt/gb_fedora_2011_17248_tor_fc16.nasl
2012-02-12Name : Gentoo Security Advisory GLSA 201201-12 (Tor)
File : nvt/glsa_201201_12.nasl
2012-02-11Name : Debian Security Advisory DSA 2263-2 (movabletype-opensource)
File : nvt/deb_2263_2.nasl
2012-02-11Name : Debian Security Advisory DSA 2363-1 (tor)
File : nvt/deb_2363_1.nasl

Open Source Vulnerability Database (OSVDB)

77947Tor or/buffers.c buf_pullup() Function Data Repacking Remote Overflow

Nessus® Vulnerability Scanner

2012-01-24Name : The remote Gentoo host is missing one or more security-related patches.
File : gentoo_GLSA-201201-12.nasl - Type : ACT_GATHER_INFO
2012-01-12Name : The remote Debian host is missing a security-related update.
File : debian_DSA-2363.nasl - Type : ACT_GATHER_INFO
2012-01-11Name : The remote Fedora host is missing a security update.
File : fedora_2011-17248.nasl - Type : ACT_GATHER_INFO

Alert History

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2014-02-17 11:30:38
  • Multiple Updates