CVE-2022-33903
First published: Mon Jun 20 2022(Updated: )
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: <a href="https://gitlab.torproject.org/tpo/core/tor/-/issues/40626">https://gitlab.torproject.org/tpo/core/tor/-/issues/40626</a> <a href="https://lists.torproject.org/pipermail/tor-announce/2022-June/000242.html">https://lists.torproject.org/pipermail/tor-announce/2022-June/000242.html</a> <a href="https://github.com/torproject/tor/commit/5a25374209689466e10906a77e66ad717a615a02">https://github.com/torproject/tor/commit/5a25374209689466e10906a77e66ad717a615a02</a> <a href="https://github.com/torproject/tor/commit/b0496d40197dd5b4fb7b694c1410082d4e34dda6">https://github.com/torproject/tor/commit/b0496d40197dd5b4fb7b694c1410082d4e34dda6</a>
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Torproject Tor | >=0.4.7.1<0.4.7.8 | |
| debian/tor | 0.4.5.16-1 0.4.7.16-1 0.4.8.12-1 |
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Reference Links
- 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
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2099228
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2099229
- https://bugzilla.redhat.com/show_bug.cgi?id=2099227
- https://security-tracker.debian.org/tracker/CVE-2022-33903
- https://security.gentoo.org/glsa/202305-11
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.
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