Reachable Assertion in Tor - CVE-2017-0376
Published: June 9, 2017 / Updated: July 18, 2020
Vulnerability identifier: #VU31418
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-2017-0376
CWE-ID: CWE-617
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.
The hidden-service feature in Tor before 0.3.0.8 allows a denial of service (assertion failure and daemon exit) in the connection_edge_process_relay_cell function via a BEGIN_DIR cell on a rendezvous circuit.
Affected software
Tor
Arch Linux
Fedora
tor (Alpine package)
tor
Arch Linux
Fedora
tor (Alpine package)
tor
How to mitigate CVE-2017-0376
Install update from vendor's website.
Tor - update to 0.3.0.8
tor (Alpine package) - update to 0.3.0.8-r0
tor - addressed in versions 0.2.9.12-1.el7, 0.2.9.12-1.fc27, 0.3.1.7-1.fc27
tor (Alpine package) - update to 0.3.0.8-r0
tor - addressed in versions 0.2.9.12-1.el7, 0.2.9.12-1.fc27, 0.3.1.7-1.fc27