CVE-2021-32625: Redis vulnerability in STRALGO LCS on 32-bit systems
Redis is an open source (BSD licensed), in-memory data structure store, used as a database, cache, and message broker. An integer overflow bug in Redis version 6.0 or newer, could be exploited using the STRALGO LCS command to corrupt the heap and potentially result with remote code execution. This is a result of an incomplete fix by CVE-2021-29477. The problem is fixed in version 6.2.4 and 6.0.14. An additional workaround to mitigate the problem without patching the redis-server executable is to use ACL configuration to prevent clients from using the STRALGO LCS command. On 64 bit systems which have the fixes of CVE-2021-29477 (6.2.3 or 6.0.13), it is sufficient to make sure that the proto-max-bulk-len config parameter is smaller than 2GB (default is 512MB).
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
alpine/redisto a version that resolves this vulnerability.Fixed in 6.0.14-r0 - Upgrade
Upgrade
alpine/redisto a version that resolves this vulnerability.Fixed in 6.2.4-r0 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 6.2.4 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 6.0.14 - Configuration
Use ACL configuration to prevent clients from using the STRALGO LCS command.
Redis ACL STRALGO LCS command access = disabled - Configuration
On 64-bit systems with the CVE-2021-29477 fixes, set proto-max-bulk-len to a value smaller than 2GB; the default is 512MB.
Redis proto-max-bulk-len = less than 2GB
Event History
Frequently Asked Questions
What is CVE-2021-32625?
CVE-2021-32625 is an integer overflow vulnerability in Redis version 6.0 or newer, which could lead to remote code execution.
What is the severity of CVE-2021-32625?
CVE-2021-32625 has a severity rating of 8.8 (high).
How can CVE-2021-32625 be exploited?
CVE-2021-32625 can be exploited using the STRALGO LCS command to corrupt the heap and potentially result in remote code execution.
Which software versions are affected by CVE-2021-32625?
Redis versions 6.0 to 6.0.14 and 6.2.0 to 6.2.4 are affected by CVE-2021-32625.
How can I fix CVE-2021-32625?
To fix CVE-2021-32625, update to Redis version 6.0.15 or 6.2.5 or later.