CVE-2021-32626
Lua scripts can overflow the heap-based Lua stack in Redis
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.
How to fix CVE-2021-32626
To remediate CVE-2021-32626, upgrade the affected package to a fixed version below.
- —upgrade to 5.0.14-r0 or later
- —upgrade to 5.0.14 or later
- —upgrade to 5.0.14 or later
- —upgrade to 5.0.14 or later
Is CVE-2021-32626 being exploited?
Moderate — EPSS is 15.1%. Track this CVE but it's not at the top of the prioritisation list.
Affected packages (4)
- >= 2.6, < 5.0.14-r0
- >= 2.6.0, < 5.0.14, >= 6.0.0, < 6.0.16, >= 6.2.0, < 6.2.6
- >= 2.6.0, < 5.0.14, >= 6.0.0, < 6.0.16, >= 6.2.0, < 6.2.6
- >= 2.6.0, < 5.0.14, >= 6.0.0, < 6.0.16, >= 6.2.0, < 6.2.6
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
References (12)
- ADVISORYsecurity.alpinelinux.org/vuln/CVE-2021-32626
- WEBgithub.com/redis/redis/commit/666ed7facf4524bf6d19b11b20faa2cf93fdf591
- WEBgithub.com/redis/redis/security/advisories/GHSA-p486-xggp-782c
- WEBlists.apache.org/thread.html/r75490c61c2cb7b6ae2c81238fd52ae13636c60435abcd732d41531a0%40%3Ccommits.druid.apache.org%3E