Vulnerability Description
Redis is an in-memory database that persists on disk. A vulnerability involving out-of-bounds read and integer overflow to buffer overflow exists starting with version 2.2 and prior to versions 5.0.13, 6.0.15, and 6.2.5. On 32-bit systems, Redis `*BIT*` command are vulnerable to integer overflow that can potentially be exploited to corrupt the heap, leak arbitrary heap contents or trigger remote code execution. The vulnerability involves changing the default `proto-max-bulk-len` configuration parameter to a very large value and constructing specially crafted commands bit commands. This problem only affects Redis on 32-bit platforms, or compiled as a 32-bit binary. Redis versions 5.0.`3m 6.0.15, and 6.2.5 contain patches for this issue. An additional workaround to mitigate the problem without patching the `redis-server` executable is to prevent users from modifying the `proto-max-bulk-len` configuration parameter. This can be done using ACL to restrict unprivileged users from using the CONFIG SET command.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Redislabs | Redis | >= 2.2.0, < 5.0.13 |
| Debian | Debian Linux | 9.0 |
| Fedoraproject | Fedora | 33 |
Related Weaknesses (CWE)
References
- https://github.com/redis/redis/security/advisories/GHSA-8wxq-j7rp-g8wjThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/07/msg00017.htmlMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/08/msg00026.htmlMailing ListThird Party Advisory
- 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/202209-17Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210827-0004/Third Party Advisory
- https://www.debian.org/security/2021/dsa-5001Third Party Advisory
- https://github.com/redis/redis/security/advisories/GHSA-8wxq-j7rp-g8wjThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/07/msg00017.htmlMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/08/msg00026.htmlMailing ListThird Party Advisory
- 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/202209-17Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210827-0004/Third Party Advisory
FAQ
What is CVE-2021-32761?
CVE-2021-32761 is a vulnerability with a CVSS score of 7.5 (HIGH). Redis is an in-memory database that persists on disk. A vulnerability involving out-of-bounds read and integer overflow to buffer overflow exists starting with version 2.2 and prior to versions 5.0.13...
How severe is CVE-2021-32761?
CVE-2021-32761 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-32761?
Check the references section above for vendor advisories and patch information. Affected products include: Redislabs Redis, Debian Debian Linux, Fedoraproject Fedora.