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Gentoo: GLSA-201201-12 Normal: Multiple Tor Risks and Threats

gentoo
Calendar Grey January 23, 2012
Dist Gentoo Esm H88
Several security flaws in Tor have been discovered that could enable attackers to execute code remotely; users are advised to update their software to address these issues.
Multiple vulnerabilities have been found in Tor, the most severe of which may allow a remote attacker to execute arbitrary code.

Summary

Multiple vulnerabilities have been discovered in Tor: * When configured as client or bridge, Tor uses the same TLS certificate chain for all outgoing connections (CVE-2011-2768). * When configured as a bridge, Tor relays can distinguish incoming bridge connections from client connections (CVE-2011-2769). * An error in or/buffers.c could result in a heap-based buffer overflow (CVE-2011-2778).

Topics%20covered

Topics Covered

security advisory denial of service gentoo code execution remote access tor

Resolution

All Tor users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=net-misc/tor-0.2.2.35"

References

[ 1 ] CVE-2011-2768 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2011-2768 [ 2 ] CVE-2011-2769 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2011-2769 [ 3 ] CVE-2011-2778 http://nvd.nist.gov/nvd.cfm?cvename=CVE-2011-2778

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: https://security.gentoo.org/glsa/201201-12
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Concerns

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users' machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.

Severity: Normal
Title: Tor: Multiple vulnerabilities
Date: January 23, 2012
Bugs: #388769, #394969
ID: 201201-12

Topics%20covered

Topics Covered

security advisory denial of service gentoo code execution remote access tor

Synopsis

Multiple vulnerabilities have been found in Tor, the most severe of which may allow a remote attacker to execute arbitrary code.

Background

Tor is an implementation of second generation Onion Routing, a connection-oriented anonymizing communication service.

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Affected Packages

------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 net-misc/tor < 0.2.2.35 >= 0.2.2.35

Impact

===== A remote attacker could possibly execute arbitrary code or cause a Denial of Service. Furthermore, a remote relay the user is directly connected to may be able to disclose anonymous information about that user or enumerate bridges in the user's connection.

Workaround

There is no known workaround at this time.

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