NULL pointer dereference in Tor - CVE-2017-8820
Published: December 3, 2017 / Updated: July 17, 2020
Vulnerability identifier: #VU31386
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2017-8820
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error. A remote attacker can trigger denial of service conditions via a malformed descriptor, aka TROVE-2017-010.
Affected software
Tor
Arch Linux
Fedora
tor
Arch Linux
Fedora
tor
How to mitigate CVE-2017-8820
Update to version 0.3.1.9.
Tor - update to 0.3.1.9
tor - addressed in versions 0.2.9.14-1.el6, 0.2.9.14-1.el7, 0.3.1.9-1.fc26, 0.3.1.9-1.fc27
tor - addressed in versions 0.2.9.14-1.el6, 0.2.9.14-1.el7, 0.3.1.9-1.fc26, 0.3.1.9-1.fc27