CVE-2021-32761
Published: 21 July 2021
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.
Priority
Status
| Package | Release | Status |
|---|---|---|
|
redis Launchpad, Ubuntu, Debian |
bionic |
Released
(5:4.0.9-1ubuntu0.2+esm3)
Available with Ubuntu Pro |
| focal |
Not vulnerable
(no 32-bit version)
|
|
| groovy |
Ignored
(end of life)
|
|
| hirsute |
Not vulnerable
(no 32-bit version)
|
|
| impish |
Released
(5:6.0.15-1)
|
|
| jammy |
Not vulnerable
(5:6.0.15-1)
|
|
| kinetic |
Not vulnerable
(5:6.0.15-1)
|
|
| lunar |
Not vulnerable
(5:6.0.15-1)
|
|
| trusty |
Released
(2:2.8.4-2ubuntu0.2+esm2)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only) |
|
| upstream |
Released
(5:6.0.15-1)
|
|
| xenial |
Released
(2:3.0.6-1ubuntu0.4+esm1)
Available with Ubuntu Pro |
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.5 |
| Attack vector | Network |
| Attack complexity | High |
| Privileges required | Low |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | High |
| Vector | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |