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Tor: Several vulnerabilities


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200606-04 / tor
Release Date June 07, 2006
Latest Revision September 05, 2006: 02
Impact normal
Exploitable remote
Package Vulnerable versions Unaffected versions Architecture(s)
net-misc/tor < >=, revision >= All supported architectures

Related bugreports: #134329


Tor is vulnerable to a possible buffer overflow, a Denial of Service, information disclosure and information leak.

2.  Impact Information


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


Some integer overflows exist when adding elements to the smartlists. Non-printable characters received from the network are not properly sanitised before being logged. There are additional unspecified bugs in the directory server and in the internal circuits.


The possible buffer overflow may allow a remote attacker to execute arbitrary code on the server by sending large inputs. The other vulnerabilities can lead to a Denial of Service, a lack of logged information, or some information disclosure.

3.  Resolution Information


There is no known workaround at this time.


All Tor users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose net-misc/tor

4.  References


Page updated June 07, 2006

Summary: This is a Gentoo Linux Security Advisory

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