Tor: Multiple vulnerabilities
Gentoo Linux Security Advisory
||GLSA 200904-11 / tor
||April 08, 2009
||April 08, 2009: 01
All supported architectures
#250018, #256078, #258833
Multiple vulnerabilities in Tor might allow for heap corruption, Denial of
Service, escalation of privileges and information disclosure.
Tor is an implementation of second generation Onion Routing, a
connection-oriented anonymizing communication service.
Theo de Raadt reported that the application does not properly drop
privileges to the primary groups of the user specified via the "User"
configuration option (CVE-2008-5397).
rovv reported that the "ClientDNSRejectInternalAddresses" configuration
option is not always enforced (CVE-2008-5398).
Ilja van Sprundel reported a heap-corruption vulnerability that might
be remotely triggerable on some platforms (CVE-2009-0414).
It has been reported that incomplete IPv4 addresses are treated as
valid, violating the specification (CVE-2009-0939).
Three unspecified vulnerabilities have also been reported
(CVE-2009-0936, CVE-2009-0937, CVE-2009-0938).
A local attacker could escalate privileges by leveraging unintended
supplementary group memberships of the Tor process. A remote attacker
could exploit these vulnerabilities to cause a heap corruption with
unknown impact and attack vectors, to cause a Denial of Service via CPU
consuption or daemon crash, and to weaken anonymity provided by the
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-0.2.0.34"