CVE-2021-32921: Race Condition
First published: Thu May 13 2021(Updated: )
An issue was discovered in Prosody before 0.11.9. It does not use a constant-time algorithm for comparing certain secret strings when running under Lua 5.2 or later. This can potentially be used in a timing attack to reveal the contents of secret strings to an attacker.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/prosody | 0.11.2-1+deb10u4 0.11.9-2+deb11u2 0.12.3-1 0.12.4-1 | |
| Prosody Prosody | <0.11.9 | |
| Lua Lua | >=5.2.0 | |
| Fedoraproject Fedora | =32 | |
| Fedoraproject Fedora | =33 | |
| Fedoraproject Fedora | =34 | |
| Debian Debian Linux | =9.0 |
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Reference Links
- https://www.openwall.com/lists/oss-security/2021/05/13/1
- https://prosody.im/security/advisory_20210512.txt
- https://hg.prosody.im/trunk/rev/c98aebe601f9
- https://hg.prosody.im/trunk/rev/13b84682518e
- https://hg.prosody.im/trunk/rev/6f56170ea986
- https://security-tracker.debian.org/tracker/CVE-2021-32921
- http://www.openwall.com/lists/oss-security/2021/05/13/1
- http://www.openwall.com/lists/oss-security/2021/05/14/2
- https://blog.prosody.im/prosody-0.11.9-released/
- https://lists.debian.org/debian-lts-announce/2021/06/msg00016.html
- https://lists.debian.org/debian-lts-announce/2021/06/msg00018.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/6MFFBZWXKPZEVZNQSVJNCUE7WRF3T7DG/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GUN63AHEWB2WRROJHU3BVJRWLONCT2B7/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LWJ2DG2DFJOEFEWOUN26IMYYWGSA2ZEE/
- https://security.gentoo.org/glsa/202105-15
- https://www.debian.org/security/2021/dsa-4916
Frequently Asked Questions
What is CVE-2021-32921?
CVE-2021-32921 is a vulnerability in Prosody before version 0.11.9 that allows for a timing attack to reveal the contents of secret strings.
How severe is CVE-2021-32921?
CVE-2021-32921 has a severity rating of medium with a CVSS score of 5.9.
Which software versions are affected by CVE-2021-32921?
Versions 0.11.2-1+deb10u4, 0.11.9-2+deb11u2, 0.12.3-1, and 0.12.4-1 of the Prosody package in Debian are affected by CVE-2021-32921.
How do I fix CVE-2021-32921?
To fix CVE-2021-32921, upgrade to Prosody version 0.11.9 or later.
Where can I find more information about CVE-2021-32921?
You can find more information about CVE-2021-32921 at the following references: [Reference 1](http://www.openwall.com/lists/oss-security/2021/05/13/1), [Reference 2](http://www.openwall.com/lists/oss-security/2021/05/14/2), [Reference 3](https://blog.prosody.im/prosody-0.11.9-released/)
- collector/security-tracker-debian
- collector/nvd-index
- package-manager/debian
- vendor/prosody
- canonical/prosody prosody
- vendor/lua
- canonical/lua lua
- version/lua lua/5.2.0
- vendor/fedoraproject
- canonical/fedoraproject fedora
- version/fedoraproject fedora/32
- version/fedoraproject fedora/33
- version/fedoraproject fedora/34
- vendor/debian
- canonical/debian debian linux
- version/debian debian linux/9.0