Improper Handling of Exceptional Conditions in Tor - CVE-2015-2688
Published: January 24, 2020 / Updated: July 17, 2020
Vulnerability identifier: #VU30428
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-2015-2688
CWE-ID:
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.
buf_pullup in Tor before 0.2.4.26 and 0.2.5.x before 0.2.5.11 does not properly handle unexpected arrival times of buffers with invalid layouts, which allows remote attackers to cause a denial of service (assertion failure and daemon exit) via crafted packets.
Affected software
Tor
Fedora
tor
Fedora
tor
How to mitigate CVE-2015-2688
Install update from vendor's website.
Tor - update to 0.2.5.11
tor - addressed in versions 0.2.4.26-1.el5, 0.2.5.11-1.el6, 0.2.5.11-1.el7, 0.2.5.11-1.fc21, 0.2.5.11-1.fc22, 0.2.5.12-1.el6, 0.2.5.12-1.el7, 0.2.5.12-1.fc22
tor - addressed in versions 0.2.4.26-1.el5, 0.2.5.11-1.el6, 0.2.5.11-1.el7, 0.2.5.11-1.fc21, 0.2.5.11-1.fc22, 0.2.5.12-1.el6, 0.2.5.12-1.el7, 0.2.5.12-1.fc22