Vulnerability Description
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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Prosody | Prosody | < 0.11.9 |
| Lua | Lua | >= 5.2.0 |
| Fedoraproject | Fedora | 32 |
| Debian | Debian Linux | 9.0 |
Related Weaknesses (CWE)
References
- http://www.openwall.com/lists/oss-security/2021/05/13/1Mailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2021/05/14/2Mailing ListMitigationThird Party Advisory
- https://blog.prosody.im/prosody-0.11.9-released/Release NotesVendor Advisory
- https://lists.debian.org/debian-lts-announce/2021/06/msg00016.htmlMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/06/msg00018.htmlThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://security.gentoo.org/glsa/202105-15Third Party Advisory
- https://www.debian.org/security/2021/dsa-4916Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/05/13/1Mailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2021/05/14/2Mailing ListMitigationThird Party Advisory
- https://blog.prosody.im/prosody-0.11.9-released/Release NotesVendor Advisory
- https://lists.debian.org/debian-lts-announce/2021/06/msg00016.htmlMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/06/msg00018.htmlThird Party Advisory
FAQ
What is CVE-2021-32921?
CVE-2021-32921 is a vulnerability with a CVSS score of 5.9 (MEDIUM). 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 ...
How severe is CVE-2021-32921?
CVE-2021-32921 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-32921?
Check the references section above for vendor advisories and patch information. Affected products include: Prosody Prosody, Lua Lua, Fedoraproject Fedora, Debian Debian Linux.