Buffer overflow in Tor - CVE-2016-8860

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Main Vulnerability Database Vulnerabilities #VU39954

Buffer overflow in Tor - CVE-2016-8860

Published: January 4, 2017 / Updated: August 9, 2020


Vulnerability identifier: #VU39954
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2016-8860
CWE-ID: CWE-119
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

Tor before 0.2.8.9 and 0.2.9.x before 0.2.9.4-alpha had internal functions that were entitled to expect that buf_t data had NUL termination, but the implementation of or/buffers.c did not ensure that NUL termination was present, which allows remote attackers to cause a denial of service (client, hidden service, relay, or authority crash) via crafted data.


Affected software

Tor
Gentoo Linux
Fedora
tor

How to mitigate CVE-2016-8860

Install update from vendor's website.

tor - addressed in versions 0.2.8.9-1.el6, 0.2.8.9-1.el7, 0.2.8.9-1.fc23, 0.2.8.9-1.fc24, 0.2.8.9-1.fc25

External References

Related Security Bulletins