CVE-2021-32627

Description

Redis is an open source, in-memory database that persists on disk. In affected versions an integer overflow bug in Redis can be exploited to corrupt the heap and potentially result with remote code execution. The vulnerability involves changing the default proto-max-bulk-len and client-query-buffer-limit configuration parameters to very large values and constructing specially crafted very large stream elements. The problem is fixed in Redis 6.2.6, 6.0.16 and 5.0.14. For users unable to upgrade an additional workaround to mitigate the problem without patching the redis-server executable is to prevent users from modifying the proto-max-bulk-len configuration parameter. This can be done using ACL to restrict unprivileged users from using the CONFIG SET command.

CvssV3 impact

Version

3.1

VectorString

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

AttackVector

NETWORK

AttackComplexity

HIGH

PrivilegesRequired

LOW

UserInteraction

NONE

Scope

UNCHANGED

ConfidentialityImpact

HIGH

IntegrityImpact

HIGH

AvailabilityImpact

HIGH

BaseScore

7.5

BaseSeverity

HIGH

CvssV2 impact

AccessComplexity

MEDIUM

ConfidentialityImpact

PARTIAL

AvailabilityImpact

PARTIAL

IntegrityImpact

PARTIAL

BaseScore

6

VectorString

AV:N/AC:M/Au:S/C:P/I:P/A:P

Version

2.0

AccessVector

NETWORK

Authentication

SINGLE