Upstream information

CVE-2021-21309 at MITRE

Description

Redis 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 “CONFIG SET proto-max-bulk-len” 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.

SUSE information

Overall state of this security issue: Analysis

This issue is currently rated as having important severity.

CVSS v2 Scores
  National Vulnerability Database
Base Score 6.5
Vector AV:N/AC:L/Au:S/C:P/I:P/A:P
Access Vector Network
Access Complexity Low
Authentication Single
Confidentiality Impact Partial
Integrity Impact Partial
Availability Impact Partial
CVSS v3 Scores
  National Vulnerability Database SUSE
Base Score 8.8 7.4
Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H
Access Vector Network Network
Access Complexity Low High
Privileges Required Low None
User Interaction None None
Scope Unchanged Unchanged
Confidentiality Impact High None
Integrity Impact High High
Availability Impact High High
CVSSv3 Version 3.1 3.1
SUSE Bugzilla entry: 1182657 [NEW]

SUSE Security Advisories:

List of released packages

Product(s) Fixed package version(s) References
SUSE Linux Enterprise Module for Server Applications 15 SP2
  • redis >= 6.0.13-1.10.1
Patchnames:
SUSE-SLE-Module-Server-Applications-15-SP2-2021-1652
SUSE Linux Enterprise Module for Server Applications 15 SP3
  • redis >= 6.0.13-1.10.1
Patchnames:
SUSE-SLE-Module-Server-Applications-15-SP3-2021-1652
openSUSE Leap 15.2
  • redis >= 6.0.13-lp152.2.3.1
  • redis-debuginfo >= 6.0.13-lp152.2.3.1
  • redis-debugsource >= 6.0.13-lp152.2.3.1
Patchnames:
openSUSE-2021-682


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.

Product(s) Source package State
SUSE Linux Enterprise Module for Server Applications 15 SP2 redis Released
SUSE Linux Enterprise Module for Server Applications 15 SP3 redis Released