SB2014073002 - Input validation error in tor.eff Tor
Published: July 30, 2014 Updated: August 10, 2020
Security Bulletin ID
SB2014073002
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Input validation error (CVE-ID: CVE-2014-5117)
The vulnerability allows a remote non-authenticated attacker to read and manipulate data.
Tor before 0.2.4.23 and 0.2.5 before 0.2.5.6-alpha maintains a circuit after an inbound RELAY_EARLY cell is received by a client, which makes it easier for remote attackers to conduct traffic-confirmation attacks by using the pattern of RELAY and RELAY_EARLY cells as a means of communicating information about hidden service names.
Remediation
Install update from vendor's website.
References
- http://secunia.com/advisories/60084
- http://secunia.com/advisories/60647
- https://blog.torproject.org/blog/tor-security-advisory-relay-early-traffic-confirmation-attack
- https://lists.torproject.org/pipermail/tor-announce/2014-July/000093.html
- https://lists.torproject.org/pipermail/tor-announce/2014-July/000094.html
- https://lists.torproject.org/pipermail/tor-talk/2014-July/034180.html
- https://trac.torproject.org/projects/tor/ticket/1038