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Integer overflow issue with intsets

High
yossigo published GHSA-m3mf-8x9w-r27q Oct 4, 2021

Package

No package listed

Affected versions

All versions

Patched versions

6.2.6, 6.0.16, 5.0.14

Description

Impact

An integer overflow bug affecting all versions of Redis can be exploited to corrupt the heap and potentially be used to leak arbitrary contents of the heap or trigger remote code execution.

The vulnerability involves changing the default set-max-intset-entries configuration parameter to a very large value and constructing specially crafted commands to manipulate sets.

Patches

The problem is fixed in Redis versions 6.2.6, 6.0.16 and 5.0.14.

Workarounds

An additional workaround to mitigate the problem without patching the redis-server executable is to prevent users from modifying the set-max-intset-entries configuration parameter. This can be done using ACL to restrict unprivileged users from using the CONFIG SET command.

Credit

This issue was discovered and reported by Pawel Wieczorkiewicz (Amazon Web Services).

For more information

If you have any questions or comments about this advisory:

Severity

High
7.5
/ 10

CVSS base metrics

Attack vector
Network
Attack complexity
High
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CVE ID

CVE-2021-32687

Weaknesses