CVE-2021-32761: Integer overflow issues with *BIT commands on 32-bit systems
First published: Wed Jul 21 2021(Updated: )
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.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Redislabs Redis | >=2.2.0<5.0.13 | |
| Redislabs Redis | >=6.0<6.0.15 | |
| Redislabs Redis | >=6.2.0<6.2.5 | |
| Debian Debian Linux | =9.0 | |
| Debian Debian Linux | =10.0 | |
| Debian Debian Linux | =11.0 | |
| Fedoraproject Fedora | =33 | |
| Fedoraproject Fedora | =34 | |
| debian/redis | 5:5.0.14-1+deb10u2 5:5.0.14-1+deb10u5 5:6.0.16-1+deb11u2 5:7.0.11-1 5:7.0.14-1 |
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Reference Links
- https://github.com/redis/redis/security/advisories/GHSA-8wxq-j7rp-g8wj
- https://lists.debian.org/debian-lts-announce/2021/07/msg00017.html
- https://lists.debian.org/debian-lts-announce/2021/08/msg00026.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/6O7AUOROBYGP5IMGJPC5HZ3R2RB6GZ5X/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VGX7RRAWGXWXEAKJTQYSDSBO2BC3SAHD/
- https://security.gentoo.org/glsa/202209-17
- https://security.netapp.com/advisory/ntap-20210827-0004/
- https://www.debian.org/security/2021/dsa-5001
- https://security-tracker.debian.org/tracker/CVE-2021-32761
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VGX7RRAWGXWXEAKJTQYSDSBO2BC3SAHD/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6O7AUOROBYGP5IMGJPC5HZ3R2RB6GZ5X/
Frequently Asked Questions
What is CVE-2021-32761?
CVE-2021-32761 is a vulnerability in Redis, an in-memory database, that allows for out-of-bounds read, integer overflow, and buffer overflow attacks.
What versions of Redis are affected by CVE-2021-32761?
Redis versions prior to 5.0.13, 6.0.15, and 6.2.5 are affected by CVE-2021-32761.
How severe is CVE-2021-32761?
CVE-2021-32761 has a severity rating of 7.5 (high).
What is the impact of CVE-2021-32761?
CVE-2021-32761 can lead to out-of-bounds read, integer overflow, and buffer overflow attacks, potentially allowing an attacker to execute arbitrary code or cause a denial of service.
How can I mitigate the vulnerability CVE-2021-32761 in Redis?
To mitigate CVE-2021-32761, it is recommended to update Redis to versions 5.0.13, 6.0.15, or 6.2.5 or later, depending on the currently installed version.
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