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

CVE-2021-32628: Vulnerability in handling large ziplists

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 ziplist data structure used by all versions of Redis can be exploited to corrupt the heap and potentially result with remote code execution. The vulnerability involves modifying the default ziplist configuration parameters (hash-max-ziplist-entries, hash-max-ziplist-value, zset-max-ziplist-entries or zset-max-ziplist-value) to a very large value, and then constructing specially crafted commands to create very large ziplists. The problem is fixed in Redis versions 6.2.6, 6.0.16, 5.0.14. An additional workaround to mitigate the problem without patching the redis-server executable is to prevent users from modifying the above configuration parameters. 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
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<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

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 above configuration parameters. 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 issue?

    The vulnerability ID for this issue is CVE-2021-32628.

  • What is Redis?

    Redis is an open-source, in-memory database that persists on disk.

  • What is the severity of CVE-2021-32628?

    The severity of CVE-2021-32628 is high with a CVSS score of 7.5.

  • How does the vulnerability in ziplist data structure in Redis affect the system?

    The vulnerability can be exploited to corrupt the heap and potentially result in remote code execution.

  • How can I fix the CVE-2021-32628 vulnerability in Redis?

    The recommended fix for CVE-2021-32628 is to update Redis to version 6.2.6 or apply the appropriate patches provided by the vendor.

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