high
7.5
CWE
190 680 125 787
Advisory Published
CVE Published
Updated

CVE-2021-41099: Integer overflow issue with strings in Redis

First published: Mon Oct 04 2021(Updated: )

Redis is an open source, in-memory database that persists on disk. An integer overflow bug in the underlying string library can be used to corrupt the heap and potentially result with denial of service or remote code execution. The vulnerability involves changing the default proto-max-bulk-len configuration parameter to a very large value and constructing specially crafted network payloads or commands. The problem is fixed in Redis versions 6.2.6, 6.0.16 and 5.0.14. 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.

Credit: security-advisories@github.com

Affected SoftwareAffected VersionHow to fix
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
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
redhat/redis<6.2.6
6.2.6
redhat/redis<6.0.16
6.0.16
redhat/redis<5.0.14
5.0.14
Redis>=5.0.0<5.0.14
Redis>=6.0.0<6.0.16
Redis>=6.2.0<6.2.6
Fedoraproject Fedora=33
Fedoraproject Fedora=34
Fedoraproject Fedora=35
Debian Debian Linux=10.0
Debian Debian Linux=11.0
Netapp Management Services For Element Software And Netapp Hci
Oracle Communications Operations Monitor=4.3
Oracle Communications Operations Monitor=4.4
Oracle Communications Operations Monitor=5.0

Remedy

https://github.com/redis/redis/commit/c6ad876774f3cc11e32681ea02a2eead00f2c521

Remedy

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

Remedy

The flaw can be mitigated by disallowing usage of the CONFIG SET command via ACL configuration. This will prevent clients from setting the `proto-max-bulk-len` configuration parameter. 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 CVE-2021-41099?

    CVE-2021-41099 is an integer overflow vulnerability in Redis that can lead to denial of service or remote code execution.

  • What is the severity of CVE-2021-41099?

    CVE-2021-41099 has a severity rating of 7.5 (High).

  • How does CVE-2021-41099 affect Redis?

    CVE-2021-41099 affects Redis by corrupting the heap through an integer overflow bug in the underlying string library.

  • How can I fix CVE-2021-41099?

    To fix CVE-2021-41099, upgrade to Redis version 6.2.6, 6.0.16, or 5.0.14, depending on your current version.

  • Where can I find more information about CVE-2021-41099?

    You can find more information about CVE-2021-41099 on the Redis GitHub page and the Redis security advisories.

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