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

CVE-2021-32627: Integer overflow issue with Streams in Redis

First published: Mon Oct 04 2021(Updated: )

Redis is an open source, in-memory database that persists on disk. In affected versions an integer overflow bug in Redis can be exploited to corrupt the heap and potentially result with remote code execution. The vulnerability involves changing the default proto-max-bulk-len and client-query-buffer-limit configuration parameters to very large values and constructing specially crafted very large stream elements. The problem is fixed in Redis 6.2.6, 6.0.16 and 5.0.14. For users unable to upgrade 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
Fedora=33
Fedora=34
Fedora=35
Debian=10.0
Debian=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

Remedy

https://github.com/redis/redis/commit/f6a40570fa63d5afdd596c78083d754081d80ae3

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-2021-32627?

    CVE-2021-32627 is an integer overflow issue found in Redis that can be exploited to corrupt the heap and potentially result in remote code execution.

  • How does CVE-2021-32627 affect Redis?

    CVE-2021-32627 involves changing the default proto-max-bulk-len and client-query-buffer-... settings in Redis, which can lead to an integer overflow vulnerability.

  • How severe is CVE-2021-32627?

    CVE-2021-32627 has a severity score of 7.5 (High).

  • Which versions of Redis are affected by CVE-2021-32627?

    Redis versions up to and including 6.2.6, 6.0.16, and 5.0.14 are affected by CVE-2021-32627.

  • How can CVE-2021-32627 be mitigated?

    To mitigate CVE-2021-32627, update Redis to version 6.2.7, 6.0.17, or 5.0.15, which contain the necessary fixes.

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