CVE-2021-32761
redis - regression update
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.
How to fix CVE-2021-32761
To remediate CVE-2021-32761, upgrade the affected package to a fixed version below.
- —upgrade to 5.0.13-r0 or later
- —upgrade to 5:6.0.15-1 or later
- —upgrade to 3:3.2.6-3+deb9u5 or later
- —upgrade to 3:3.2.6-3+deb9u6 or later
Is CVE-2021-32761 being exploited?
Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.
Affected packages (4)
- from 0, < 5.0.13-r0
- from 0, < 5:6.0.15-1
- from 0, < 3:3.2.6-3+deb9u5
- from 0, < 3:3.2.6-3+deb9u6
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |