Lua scripts can overflow the heap-based Lua stack in Redis
CVE-2021-32626

7.5HIGH

Key Information:

Vendor
Redis
Status
Redis
Vendor
CVE Published:
4 October 2021

Summary

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 Version(s)

redis >= 6.2.0, < 6.2.6 < 6.2.0, 6.2.6

redis >= 6.0.0, < 6.0.16 < 6.0.0, 6.0.16

redis >= 2.6.0, < 5.0.14 < 2.6.0, 5.0.14

References

https://github.com/redis/redis/security/advisories/GHSA-p...
x_refsource_CONFIRM
https://github.com/redis/redis/commit/666ed7facf4524bf6d1...
x_refsource_MISC
https://lists.fedoraproject.org/archives/list/package-ann...
vendor-advisoryx_refsource_FEDORA

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.