CVE-2021-32765

Integer Overflow to Buffer Overflow in Hiredis

Severity Score

8.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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](https://github.com/redis/hiredis#reader-max-array-elements) context option to a value small enough that no overflow is possible.

Hiredis es una librería cliente minimalista en C para la base de datos Redis. En las versiones afectadas, Hiredis es vulnerable al desbordamiento de enteros si se proporcionan datos del protocolo "RESP" "multi-bulk" maliciosamente diseñados o corruptos. Cuando se analizan las respuestas "multi-bulk" (tipo array), hiredis no comprueba si "count * sizeof(redisReply*)" puede representarse en "SIZE_MAX". Si no puede, y la llamada a "calloc()" no hace por sí misma esta comprobación, se produciría una asignación corta y el consiguiente desbordamiento del búfer. Los usuarios de hiredis que no puedan actualizar pueden establecer la opción de contexto [maxelements](https://github.com/redis/hiredis#reader-max-array-elements) a un valor lo suficientemente pequeño como para que no sea posible el desbordamiento

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

Single

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-05-12 CVE Reserved
2021-10-04 CVE Published
2024-08-03 CVE Updated
2024-09-09 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-190: Integer Overflow or Wraparound
CWE-680: Integer Overflow to Buffer Overflow

CAPEC

References (6)

URL	Tag	Source
https://github.com/redis/hiredis/security/advisories/GHSA-hfm9-39pp-55p2	Mitigation
https://lists.debian.org/debian-lts-announce/2021/10/msg00007.html	Mailing List
https://security.netapp.com/advisory/ntap-20211104-0003	Third Party Advisory
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	Third Party Advisory

URL	Date	SRC

URL	Date	SRC
https://github.com/redis/hiredis/commit/76a7b10005c70babee357a7d0f2becf28ec7ed1e	2022-12-07

URL	Date	SRC
https://security.gentoo.org/glsa/202210-32	2022-12-07

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Redis Search vendor "Redis"		Hiredis Search vendor "Redis" for product "Hiredis"				< 1.0.1 Search vendor "Redis" for product "Hiredis" and version " < 1.0.1"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0"		-		Affected
Netapp Search vendor "Netapp"		Management Services For Element Software And Netapp Hci Search vendor "Netapp" for product "Management Services For Element Software And Netapp Hci"				-		-		Affected