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CVE-2021-32762— Integer overflow that can lead to heap overflow in redis-cli, redis-sentinel on some platforms

Quick assessment

Affected
redis redis
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Redis Labs Redis是美国Redis Labs公司的一套开源的使用ANSI C编写、支持网络、可基于内存亦可持久化的日志型、键值（Key-Value）存储数据库，并提供多种语言的API。 Redis 存在安全漏洞，该漏洞源于命令行工具redis-cli和redis-sentinel服务在解析专门制作的大型多批量网络回复时可能容易出现整数溢出。

CVSS 7.5 · High EPSS 2.56% · P85

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-32762

Vulnerability Information
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Vulnerability Title
Integer overflow that can lead to heap overflow in redis-cli, redis-sentinel on some platforms
Source: CVE Program / CVE List V5
Vulnerability Description
Redis is an open source, in-memory database that persists on disk. The redis-cli command line tool and redis-sentinel service may be vulnerable to integer overflow when parsing specially crafted large multi-bulk network replies. This is a result of a vulnerability in the underlying hiredis library which does not perform an overflow check before calling the calloc() heap allocation function. This issue only impacts systems with heap allocators that do not perform their own overflow checks. Most modern systems do and are therefore not likely to be affected. Furthermore, by default redis-sentinel uses the jemalloc allocator which is also not vulnerable. The problem is fixed in Redis versions 6.2.6, 6.0.16 and 5.0.14.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5
Vulnerability Title
Redis Labs Redis 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Redis Labs Redis是美国Redis Labs公司的一套开源的使用ANSI C编写、支持网络、可基于内存亦可持久化的日志型、键值（Key-Value）存储数据库，并提供多种语言的API。 Redis 存在安全漏洞，该漏洞源于命令行工具redis-cli和redis-sentinel服务在解析专门制作的大型多批量网络回复时可能容易出现整数溢出。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
redis redis < 5.0.14 -

II. Public POCs for CVE-2021-32762

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III. Intelligence Information for CVE-2021-32762

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Patches & Fixes for CVE-2021-32762 (1)

Vendor Advisories for CVE-2021-32762 (5)

Mailing List Discussions for CVE-2021-32762 (3)

Same Patch Batch · redis · 2021-10-04 · 9 CVEs total

CVE-2021-32765 8.8 HIGH Integer Overflow to Buffer Overflow in Hiredis
CVE-2021-32626 7.5 HIGH Lua scripts can overflow the heap-based Lua stack in Redis
CVE-2021-32627 7.5 HIGH Integer overflow issue with Streams in Redis
CVE-2021-32628 7.5 HIGH Vulnerability in handling large ziplists
CVE-2021-32675 7.5 HIGH DoS vulnerability in Redis
CVE-2021-32687 7.5 HIGH Integer overflow issue with intsets in Redis
CVE-2021-41099 7.5 HIGH Integer overflow issue with strings in Redis
CVE-2021-32672 5.3 MEDIUM Vulnerability in Lua Debugger in Redis

IV. Related Vulnerabilities

Same product: redis
Same vendor: redis
Same weakness: CWE-190

V. Comments for CVE-2021-32762

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