CVE-2021-32761

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.

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-32761
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-32761
https://github.com/redis/redis/security/advisories/GHSA-8wxq-j7rp-g8wj