CVE-2021-32761

NameCVE-2021-32761
DescriptionRedis 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDLA-2717-1, DLA-2717-2
NVD severitymedium
Debian Bugs991375

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
redis (PTS)stretch3:3.2.6-3+deb9u3vulnerable
stretch (security)3:3.2.6-3+deb9u9fixed
buster5:5.0.3-4+deb10u3vulnerable
buster (security)5:5.0.14-1+deb10u1fixed
bullseye5:6.0.15-1fixed
bullseye (security)5:6.0.16-1+deb11u1fixed
bookworm, sid5:6.0.16-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
redissourcestretch3:3.2.6-3+deb9u6DLA-2717-2
redissourcebuster5:5.0.14-1+deb10u1
redissource(unstable)5:6.0.15-1991375

Notes

https://github.com/redis/redis/security/advisories/GHSA-8wxq-j7rp-g8wj

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