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

CVE-2021-32687: Integer overflow issue with intsets 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 affecting all versions of Redis can be exploited to corrupt the heap and potentially be used to leak arbitrary contents of the heap or trigger remote code execution. The vulnerability involves changing the default set-max-intset-entries configuration parameter to a very large value and constructing specially crafted commands to manipulate sets. 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 set-max-intset-entries 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
Redis Redis>=5.0.0<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
Debian Debian Linux=10.0
Debian Debian Linux=11.0
Netapp Management Services For Element Software
Netapp Management Services For Netapp Hci
Oracle Communications Operations Monitor=4.3
Oracle Communications Operations Monitor=4.4
Oracle Communications Operations Monitor=5.0
redhat/redis<6.2.6
6.2.6
redhat/redis<6.0.16
6.0.16
redhat/redis<5.0.14
5.0.14
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/a30d367a71b7017581cf1ca104242a3c644dec0f

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 `set-max-intset-entries` 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-2021-32687?

    CVE-2021-32687 is an integer overflow issue found in Redis, an open-source in-memory database, that can potentially lead to heap corruption and remote code execution.

  • How does CVE-2021-32687 affect Redis?

    CVE-2021-32687 affects all versions of Redis.

  • What is the severity of CVE-2021-32687?

    The severity of CVE-2021-32687 is high, with a CVSS score of 7.5.

  • How can CVE-2021-32687 be exploited?

    CVE-2021-32687 can be exploited by changing the default set-max-intset-entries configuration.

  • How do I fix CVE-2021-32687?

    To fix CVE-2021-32687, it is recommended to update Redis to version 6.2.6 or apply the appropriate patches provided by the vendor.

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