[ GLSA 200904-11 ] Tor: Multiple vulnerabilities

[GLSA]

Gentoo Linux Security Advisory

Title: Tor: Multiple vulnerabilities (GLSA 200904-11)
Severity: high
Exploitable: remote
Date: April 08, 2009
Bug(s): #250018, #256078, #258833
ID: 200904-11

Synopsis


Multiple vulnerabilities in Tor might allow for heap corruption, Denial of
Service, escalation of privileges and information disclosure.


Background


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


Affected Packages

Package: net-misc/tor
Vulnerable: < 0.2.0.34
Unaffected: >= 0.2.0.34
Architectures: All supported architectures


Description

• 
  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).
  

Impact


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
service.


Workaround


There is no known workaround at this time.


Resolution


All Tor users should upgrade to the latest version: