CVE-2021-32628 Vulnerability in handling large ziplists
An integer overflow in Redis ziplist handling allows remote code execution if default configuration limits are increased, requiring an upgrade or ACL restrictions.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-32628?
CVE-2021-32628 is a high-severity vulnerability in Debian Debian Linux, published on 4 Oct 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2021-32628?
3 open source packages ship an affected version, including keydb, redis and valkey. It affects 6 products.
| Package | Affected | Fixed in |
|---|---|---|
keydb Bitnami | From 5.0.0 | 5.0.14, 6.0.16, 6.2.6 |
redis Bitnami | From 5.0.0 | 5.0.14, 6.0.16, 6.2.6 |
valkey Bitnami | From 5.0.0 | 5.0.14, 6.0.16, 6.2.6 |
Products include Debian Debian Linux, Fedoraproject Fedora, Netapp Management Services for Element Software, Netapp Management Services for Netapp Hci, Oracle Communications Operations Monitor, Redis Redis.
How do I fix CVE-2021-32628?
Upgrade keydb to a fixed version for your release line: 5.0.14, 6.0.16 or 6.2.6.
Is CVE-2021-32628 being exploited?
There is no known exploitation of CVE-2021-32628 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as ALPINE-CVE-2021-32628, AZL-6846, BIT-keydb-2021-32628, BIT-redis-2021-32628, BIT-valkey-2021-32628, CLEANSTART-2026-NQ76206 and 3 more.