Heap-based buffer overflow in Tor before 0.2.1.29 and 0.2.2.x before 0.2.2.21-alpha allows remote attackers to cause a denial of service (memory corruption and application crash) or possibly execute arbitrary code via unspecified vectors.

The remote host is affected by the vulnerability described in GLSA-201110-13 (Tor: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in Tor. Please review the       CVE identifiers referenced below for details.
  Impact :

    A remote unauthenticated attacker may be able to execute arbitrary code       with the privileges of the Tor process or create a Denial of Service.
  Workaround :

    There is no known workaround at this time.

- Mon Jan 17 2011 Enrico Scholz <enrico.scholz at     informatik.tu-chemnitz.de> - 0.2.1.29-1300

    - updated to 0.2.1.29 (SECURITY)

    - CVE-2011-0427: heap overflow bug, potential remote       code execution

    - Tue Dec 21 2010 Luke Macken <lmacken at redhat.com> -       0.2.1.28-1300

    - updated to 0.2.1.28 (SECURITY: fixes a remotely       exploitable heap overflow bug)

    - Fri Nov 26 2010 Enrico Scholz <enrico.scholz at       informatik.tu-chemnitz.de> - 0.2.1.27-1300

    - updated to 0.2.1.27

    - work around broken chkconfig by adding dummy       Default-Start: in -lsb (#647512)

    - Fri Nov 26 2010 Enrico Scholz <enrico.scholz at       informatik.tu-chemnitz.de>

    - fixed 'limit' statement in upstart script

    - Tue Jun 1 2010 Enrico Scholz <enrico.scholz at       informatik.tu-chemnitz.de> - 0.2.1.26-1300

    - updated to 0.2.1.26

    - removed workaround to install lsb initscript because       parts of the underlying problem have been fixed in       redhat-lsb and the remaining ones were solved by       previous commit

  - Tue Jun 1 2010 Enrico Scholz <enrico.scholz at     informatik.tu-chemnitz.de> - 0.2.1.25-1301

    - removed $local_fs dependency in -lsb initscript to       workaround buggy redhat-lsb; $remote_fs should imply       it

  - Thu Mar 18 2010 Enrico Scholz <enrico.scholz at     informatik.tu-chemnitz.de> - 0.2.1.25-1300

    - updated to 0.2.1.25

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

- Mon Jan 17 2011 Enrico Scholz <enrico.scholz at     informatik.tu-chemnitz.de> - 0.2.1.29-1400

    - updated to 0.2.1.29 (SECURITY)

    - CVE-2011-0427: heap overflow bug, potential remote       code execution

    - Tue Dec 21 2010 Luke Macken <lmacken at redhat.com> -       0.2.1.28-1400

    - updated to 0.2.1.28 (SECURITY: fixes a remotely       exploitable heap overflow bug)

    - Fri Nov 26 2010 Enrico Scholz <enrico.scholz at       informatik.tu-chemnitz.de> - 0.2.1.27-1400

    - updated to 0.2.1.27

    - work around broken chkconfig by adding dummy       Default-Start: in -lsb (#647512)

    - Fri Nov 26 2010 Enrico Scholz <enrico.scholz at       informatik.tu-chemnitz.de> - 0.2.1.26-1401

    - fixed 'limit' statement in upstart script

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The Tor Project reports :

A remote heap overflow vulnerability that can allow remote code execution. Other fixes address a variety of assert and crash bugs, most of which we think are hard to exploit remotely. All Tor users should upgrade.

The developers of Tor, an anonymizing overlay network for TCP, found three security issues during a security audit. A heap overflow allowed the execution of arbitrary code (CVE-2011-0427 ), a denial of service vulnerability was found in the zlib compression handling and some key memory was incorrectly zeroed out before being freed. The latter two issues do not yet have CVE identifiers assigned. The Debian Security Tracker will be updated once they're available:
https://security-tracker.debian.org/tracker/source-package/tor

ID	Name	Product	Family	Severity
56549	GLSA-201110-13 : Tor: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	medium
55002	Fedora 13 : tor-0.2.1.29-1300.fc13 (2011-0650)	Nessus	Fedora Local Security Checks	medium
53901	Fedora 14 : tor-0.2.1.29-1400.fc14 (2011-0642)	Nessus	Fedora Local Security Checks	medium
51560	FreeBSD : tor -- remote code execution and crash (38bdf10e-2293-11e0-bfa4-001676740879)	Nessus	FreeBSD Local Security Checks	medium
51559	Debian DSA-2148-1 : tor - several vulnerabilities	Nessus	Debian Local Security Checks	medium

Detections

Analytics

CVE-2011-0427

critical

Tenable Plugins

medium

medium

medium

medium

medium