Vulnerability · Published Jul 21, 2021 · Assigned by GitHub_M
CVE-2021-32761Integer overflow issues with *BIT commands on 32-bit systems
High 7.5
In plain English
A high-severity out-of-bounds read in redis from redis. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 30.1% (higher than 98% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | redis | 6.2.5-r0 | ALPINE-CVE-2021-32761 |
| Alpine:v3.21 | redis | 6.2.5-r0 | ALPINE-CVE-2021-32761 |
| Alpine:v3.22 | redis | 6.2.5-r0 | ALPINE-CVE-2021-32761 |
| Alpine:v3.23 | redis | 6.2.5-r0 | ALPINE-CVE-2021-32761 |
| Alpine:v3.24 | redis | 6.2.5-r0 | ALPINE-CVE-2021-32761 |
| Debian:12 | redis | 5:6.0.15-1 | DEBIAN-CVE-2021-32761 |
| Debian:13 | redis | 5:6.0.15-1 | DEBIAN-CVE-2021-32761 |
| Debian:14 | redis | 5:6.0.15-1 | DEBIAN-CVE-2021-32761 |
Affected products (as reported)
Weakness: CWE-125, CWE-680 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
References
- https://github.com/redis/redis/security/advisories/GHSA-8wxq-j7rp-g8wj x_refsource_CONFIRM
- [debian-lts-announce] 20210722 [SECURITY] [DLA 2717-1] redis security update mailing-list, x_refsource_MLIST
- FEDORA-2021-10d54c261f vendor-advisory, x_refsource_FEDORA
- FEDORA-2021-76cf1653b3 vendor-advisory, x_refsource_FEDORA
- https://security.netapp.com/advisory/ntap-20210827-0004/ x_refsource_CONFIRM
- [debian-lts-announce] 20210827 [SECURITY] [DLA 2717-2] redis security update mailing-list, x_refsource_MLIST
- DSA-5001 vendor-advisory, x_refsource_DEBIAN
- GLSA-202209-17 vendor-advisory, x_refsource_GENTOO