high
8.8
CWE
122 787 119
Advisory Published
CVE Published
Updated

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

First published: Mon Oct 04 2021(Updated: )

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.

Credit: security-advisories@github.com

Affected SoftwareAffected VersionHow to fix
redhat/redis<6.2.6
6.2.6
redhat/redis<6.0.16
6.0.16
redhat/redis<5.0.14
5.0.14
redhat/redis<0:3.2.8-5.el7
0:3.2.8-5.el7
redhat/rh-redis5-redis<0:5.0.5-3.el7
0:5.0.5-3.el7
Redis Redis>=2.6<5.0.14
Redis Redis>=6.0.0<6.0.16
Redis Redis>=6.2.0<6.2.6
Fedoraproject Fedora=33
Fedoraproject Fedora=34
Fedoraproject Fedora=35
Netapp Management Services For Element Software
Netapp Management Services For Netapp Hci
Debian Debian Linux=10.0
Debian Debian Linux=11.0
Oracle Communications Operations Monitor=4.3
Oracle Communications Operations Monitor=4.4
Oracle Communications Operations Monitor=5.0
debian/redis
5:5.0.14-1+deb10u2
5:5.0.14-1+deb10u5
5:6.0.16-1+deb11u2
5:7.0.11-1
5:7.0.14-1

Remedy

https://github.com/redis/redis/commit/666ed7facf4524bf6d19b11b20faa2cf93fdf591

Remedy

https://www.oracle.com/security-alerts/cpuapr2022.html

Remedy

Prevent users from executing Lua scripts. This can be done using ACL to restrict EVAL and EVALSHA commands. Please see https://redis.io/topics/acl for more information on how to do this.

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the vulnerability ID for this vulnerability?

    The vulnerability ID for this vulnerability is CVE-2021-32626.

  • What is the severity of CVE-2021-32626?

    The severity of CVE-2021-32626 is high with a severity value of 8.8.

  • Which software versions are affected by CVE-2021-32626?

    CVE-2021-32626 affects Redis versions 2.6 to 6.2.6.

  • How can this vulnerability be fixed?

    To fix CVE-2021-32626, upgrade to Redis version 6.2.6.

  • Are there any references or additional information for CVE-2021-32626?

    Yes, there are references and additional information available for CVE-2021-32626. They can be found at the following links: [Link 1](https://github.com/redis/redis/commit/666ed7facf4524bf6d19b11b20faa2cf93fdf591), [Link 2](https://github.com/redis/redis/security/advisories/GHSA-p486-xggp-782c), [Link 3](https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2012217).

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