CVE-2022-33903: High severity torproject Tor vulnerability
A Denial of Service issue was fixed in tor 0.4.7.8 related to congestion control. RTT estimation can become wedged, seriously degrading congestion control performance on all circuits. This impacts clients, onion services, and relays, and can be triggered remotely by a malicious endpoint.
References: https://gitlab.torproject.org/tpo/core/tor/-/issues/40626 https://lists.torproject.org/pipermail/tor-announce/2022-June/000242.html https://github.com/torproject/tor/commit/5a25374209689466e10906a77e66ad717a615a02 https://github.com/torproject/tor/commit/b0496d40197dd5b4fb7b694c1410082d4e34dda6
Other sources
Tor 0.4.7.x before 0.4.7.8 allows a denial of service via the wedging of RTT estimation.
— MITRE
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
alpine/torto a version that resolves this vulnerability.Fixed in 0.4.7.8-r0 - Upgrade
Upgrade
debian/torto a version that resolves this vulnerability.Fixed in 0.4.7.8-1 - Upgrade
Upgrade
debian/torto a version that resolves this vulnerability.Fixed in 0.4.9.11-0+deb12u1Fixed in 0.4.9.11-0+deb13u1Fixed in 0.4.9.15-0+deb13u1Fixed in 0.4.9.15-1Fixed in 0.4.9.16-1 - Upgrade
Upgrade
Torto a version that resolves this vulnerability.Fixed in 0.4.7.8
Event History
Frequently Asked Questions
What is the vulnerability ID for this issue?
The vulnerability ID for this issue is CVE-2022-33903.
What is the severity of CVE-2022-33903?
The severity of CVE-2022-33903 is high with a severity value of 7.5.
How does CVE-2022-33903 impact Tor 0.4.7.x before 0.4.7.8?
CVE-2022-33903 allows a denial of service via the wedging of RTT estimation in Tor 0.4.7.x before 0.4.7.8.
What is the affected software?
The affected software is Tor 0.4.7.x before 0.4.7.8 and Torproject Tor.
How can I fix CVE-2022-33903?
To fix CVE-2022-33903, you should upgrade to Tor version 0.4.7.8 or higher.