#VU31388 Use-after-free in Tor - CVE-2017-8823

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Main Vulnerability Database Vulnerabilities #VU31388

#VU31388 Use-after-free in Tor - CVE-2017-8823

Published: December 3, 2017 / Updated: July 17, 2020


Vulnerability identifier: #VU31388
Vulnerability risk: High
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2017-8823
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vulnerable software:
Tor
Software vendor:
tor.eff.org

Description

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

In Tor before 0.2.5.16, 0.2.6 through 0.2.8 before 0.2.8.17, 0.2.9 before 0.2.9.14, 0.3.0 before 0.3.0.13, and 0.3.1 before 0.3.1.9, there is a use-after-free in onion service v2 during intro-point expiration because the expiring list is mismanaged in certain error cases, aka TROVE-2017-013.


Remediation

Install update from vendor's website.

External links