Input validation error in Tor - CVE-2014-5117
Published: July 30, 2014 / Updated: August 10, 2020
Vulnerability identifier: #VU41438
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2014-5117
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Tor
Fedora
tor
Fedora
tor
How to mitigate CVE-2014-5117
Install update from vendor's website.
tor - update to 0.2.4.23-1.el6
External 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