N/A - DSA-3203

Executive Summary

Summary
Title	tor security update

Informations
Name	DSA-3203	First vendor Publication	2015-03-22
Vendor	Debian	Last vendor Modification	2015-03-22
Severity (Vendor)	N/A	Revision	1

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score	NA
Base Score	NA	Environmental Score	NA
impact SubScore	NA	Temporal Score	NA
Exploitabality Sub Score	NA

Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector :
Cvss Base Score	Not Defined	Attack Range	Not Defined
Cvss Impact Score	Not Defined	Attack Complexity	Not Defined
Cvss Expoit Score	Not Defined	Authentication	Not Defined
Calculate full CVSS 2.0 Vectors scores

Detail

Several denial-of-service issues have been discovered in Tor, a connection-based low-latency anonymous communication system.

o Jowr discovered that very high DNS query load on a relay could trigger an assertion error.

o A relay could crash with an assertion error if a buffer of exactly the wrong layout was passed to buf_pullup() at exactly the wrong time.

For the stable distribution (wheezy), these problems have been fixed in version 0.2.4.26-1.

For the testing distribution (jessie) and unstable distribution (sid), these problems have been fixed in version 0.2.5.11-1.

Furthermore, this update disables support for SSLv3 in Tor. All versions of OpenSSL in use with Tor today support TLS 1.0 or later.

Additionally, this release updates the geoIP database used by Tor as well as the list of directory authority servers, which Tor clients use to bootstrap and who sign the Tor directory consensus document.

We recommend that you upgrade your tor packages.