CVE-2021-32765 Information

Description

Hiredis is a minimalistic C client library for the Redis database. In affected versions Hiredis is vulnurable to integer overflow if provided maliciously crafted or corrupted RESP mult-bulk protocol data. When parsing multi-bulk (array-like) replies hiredis fails to check if count sizeof(redisReply) can be represented in SIZE_MAX. If it can not and the calloc() call doesn’t itself make this check it would result in a short allocation and subsequent buffer overflow. Users of hiredis who are unable to update may set the maxelements context option to a value small enough that no overflow is possible.

CVSS Vector

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

Reference

https://wiki.sei.cmu.edu/confluence/display/c/MEM07-C.+Ensure+that+the+arguments+to+calloc%28%29%2C+when+multiplied%2C+do+not+wrap https://github.com/redis/hiredis/security/advisories/GHSA-hfm9-39pp-55p2 https://github.com/redis/hiredis/commit/76a7b10005c70babee357a7d0f2becf28ec7ed1e https://lists.debian.org/debian-lts-announce/2021/10/msg00007.html https://security.netapp.com/advisory/ntap-20211104-0003/

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

8.8