Vulnerability · Published Oct 4, 2021 · Assigned by GitHub_M
CVE-2021-32626Lua scripts can overflow the heap-based Lua stack in Redis
High 7.5
In plain English
A high-severity heap buffer overflow 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 16.2% (higher than 97% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Redis is an open source, in-memory database that persists on disk. In affected versions specially crafted Lua scripts executing in Redis can cause the heap-based Lua stack to be overflowed, due to incomplete checks for this condition. This can result with heap corruption and potentially remote code execution. This problem exists in all versions of Redis with Lua scripting support, starting from 2.6. The problem is fixed in versions 6.2.6, 6.0.16 and 5.0.14. For users unable to update an additional workaround to mitigate the problem without patching the redis-server executable is to prevent users from executing Lua scripts. This can be done using ACL to restrict EVAL and EVALSHA commands.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | redis | 5.0.3-5.module_el8.4.0+2583+b9845322 | ALSA-2021:3918 |
| AlmaLinux:8 | redis | 5.0.3-5.module_el8.5.0+66+fc19ec12 | ALSA-2021:3918 |
| AlmaLinux:8 | redis | 6.0.9-5.module_el8.5.0+67+a3c431d9 | ALSA-2021:3945 |
| AlmaLinux:8 | redis | 6.0.9-5.module_el8.4.0+2584+1bb0d2aa | ALSA-2021:3945 |
| AlmaLinux:8 | redis-devel | 6.0.9-5.module_el8.4.0+2584+1bb0d2aa | ALSA-2021:3945 |
| AlmaLinux:8 | redis-devel | 6.0.9-5.module_el8.5.0+67+a3c431d9 | ALSA-2021:3945 |
| AlmaLinux:8 | redis-devel | 5.0.3-5.module_el8.5.0+66+fc19ec12 | ALSA-2021:3918 |
| AlmaLinux:8 | redis-devel | 5.0.3-5.module_el8.4.0+2583+b9845322 | ALSA-2021:3918 |
| AlmaLinux:8 | redis-doc | 5.0.3-5.module_el8.4.0+2583+b9845322 | ALSA-2021:3918 |
| AlmaLinux:8 | redis-doc | 6.0.9-5.module_el8.4.0+2584+1bb0d2aa | ALSA-2021:3945 |
| Alpine:v3.20 | redis | 6.2.6-r0 | ALPINE-CVE-2021-32626 |
| Alpine:v3.21 | redis | 6.2.6-r0 | ALPINE-CVE-2021-32626 |
| Alpine:v3.22 | redis | 6.2.6-r0 | ALPINE-CVE-2021-32626 |
| Alpine:v3.23 | redis | 6.2.6-r0 | ALPINE-CVE-2021-32626 |
| Alpine:v3.24 | redis | 6.2.6-r0 | ALPINE-CVE-2021-32626 |
| Debian:12 | redis | 5:6.0.16-1 | DEBIAN-CVE-2021-32626 |
| Debian:13 | redis | 5:6.0.16-1 | DEBIAN-CVE-2021-32626 |
| Debian:14 | redis | 5:6.0.16-1 | DEBIAN-CVE-2021-32626 |
| Rocky Linux:8 | redis | 0:6.0.9-5.module+el8.4.0+660+a8447b97 | RLSA-2021:3945 |
| Rocky Linux:8 | redis | 0:6.0.9-5.module+el8.5.0+658+72172854 | RLSA-2021:3945 |
| Rocky Linux:8 | redis | 0:5.0.3-5.module+el8.4.0+659+cf535ef1 | RLSA-2021:3918 |
| Rocky Linux:8 | redis | 0:5.0.3-5.module+el8.5.0+657+2674830e | RLSA-2021:3918 |
Affected products (as reported)
Weakness: CWE-122, CWE-787 · 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-p486-xggp-782c x_refsource_CONFIRM
- https://github.com/redis/redis/commit/666ed7facf4524bf6d19b11b20faa2cf93fdf591 x_refsource_MISC
- FEDORA-2021-8913c7900c vendor-advisory, x_refsource_FEDORA
- FEDORA-2021-61c487f241 vendor-advisory, x_refsource_FEDORA
- [druid-commits] 20211025 [GitHub] [druid] jihoonson opened a new pull request #11844: Bump netty4 to 4.1.68; suppress CVE-2021-37136 and CVE-2021-37137 for netty3 mailing-list, x_refsource_MLIST
- FEDORA-2021-aa94492a09 vendor-advisory, x_refsource_FEDORA
- DSA-5001 vendor-advisory, x_refsource_DEBIAN
- https://www.oracle.com/security-alerts/cpuapr2022.html x_refsource_MISC
- https://security.netapp.com/advisory/ntap-20211104-0003/ x_refsource_CONFIRM
- GLSA-202209-17 vendor-advisory, x_refsource_GENTOO