tor - several

Several vulnerabilities have been discovered in Tor, an online privacy
tool.

• CVE-2012-3518
  Avoid an uninitialised memory read when reading a vote or consensus
  document that has an unrecognized flavour name. This could lead to
  a remote crash, resulting in denial of service.
• CVE-2012-3519
  Try to leak less information about what relays a client is choosing to
  a side-channel attacker.
• CVE-2012-4419
  By providing specially crafted date strings to a victim tor instance,
  an attacker can cause it to run into an assertion and shut down.

Additionally the update to stable includes the following fixes:
when waiting for a client to renegotiate, don’t allow it to add any
bytes to the input buffer. This fixes a potential DoS issue
[tor-5934,
tor-6007].

For the stable distribution (squeeze), these problems have been fixed in
version 0.2.2.39-1.

For the unstable distribution, these problems have been fixed in version
0.2.3.22-rc-1.

We recommend that you upgrade your tor packages.