DescriptionRedis is an open-source, in-memory database that persists on disk. In affected versions of Redis an integer overflow bug in 32-bit Redis version 4.0 or newer could be exploited to corrupt the heap and potentially result with remote code execution. Redis 4.0 or newer uses a configurable limit for the maximum supported bulk input size. By default, it is 512MB which is a safe value for all platforms. If the limit is significantly increased, receiving a large request from a client may trigger several integer overflow scenarios, which would result with buffer overflow and heap corruption. We believe this could in certain conditions be exploited for remote code execution. By default, authenticated Redis users have access to all configuration parameters and can therefore use the âCONFIG SET proto-max-bulk-lenâ to change the safe default, making the system vulnerable. **This problem only affects 32-bit Redis (on a 32-bit system, or as a 32-bit executable running on a 64-bit system).** The problem is fixed in version 6.2, and the fix is back ported to 6.0.11 and 5.0.11. Make sure you use one of these versions if you are running 32-bit Redis. An additional workaround to mitigate the problem without patching the redis-server executable is to prevent clients from directly executing `CONFIG SET`: Using Redis 6.0 or newer, ACL configuration can be used to block the command. Using older versions, the `rename-command` configuration directive can be used to rename the command to a random string unknown to users, rendering it inaccessible. Please note that this workaround may have an additional impact on users or operational systems that expect `CONFIG SET` to behave in certain ways.
Overall state of this security issue: Analysis
This issue is currently rated as having important severity.
|National Vulnerability Database|
|National Vulnerability Database||SUSE|
- SUSE-SU-2021:1652-1, published Wed May 19 16:28:15 UTC 2021
- openSUSE-SU-2021:0682-1, published Sat May 8 00:38:59 2021
List of released packages
|Product(s)||Fixed package version(s)||References|
|SUSE Linux Enterprise Module for Server Applications 15 SP2|| ||Patchnames: |
|SUSE Linux Enterprise Module for Server Applications 15 SP3|| ||Patchnames: |
|openSUSE Leap 15.2|| ||Patchnames: |
Status of this issue by product and package
Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification.
|SUSE Linux Enterprise Module for Server Applications 15 SP2||redis||Released|
|SUSE Linux Enterprise Module for Server Applications 15 SP3||redis||Released|