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CVE-2021-32761— Integer overflow issues with *BIT commands on 32-bit systems

Quick assessment

Affected
redis redis
Exploitation
High exploitation probability; assess promptly
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，该漏洞涉及将默认的“proto-max-bulk-len”配置参数更改为一个非常大的值，并构造专门制作的命令位命令。

CVSS 7.5 · High EPSS 31.17% · P98

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-32761

Vulnerability Information
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Vulnerability Title
Integer overflow issues with *BIT commands on 32-bit systems
Source: CVE Program / CVE List V5
Vulnerability Description
Redis is an in-memory database that persists on disk. A vulnerability involving out-of-bounds read and integer overflow to buffer overflow exists starting with version 2.2 and prior to versions 5.0.13, 6.0.15, and 6.2.5. On 32-bit systems, Redis `*BIT*` command are vulnerable to integer overflow that can potentially be exploited to corrupt the heap, leak arbitrary heap contents or trigger remote code execution. The vulnerability involves changing the default `proto-max-bulk-len` configuration parameter to a very large value and constructing specially crafted commands bit commands. This problem only affects Redis on 32-bit platforms, or compiled as a 32-bit binary. Redis versions 5.0.`3m 6.0.15, and 6.2.5 contain patches for this issue. 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.
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
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
Redis 输入验证错误漏洞
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，该漏洞涉及将默认的“proto-max-bulk-len”配置参数更改为一个非常大的值，并构造专门制作的命令位命令。
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 >= 2.2, < 5.0.13 -

II. Public POCs for CVE-2021-32761

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III. Intelligence Information for CVE-2021-32761

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Vendor Advisories for CVE-2021-32761 (4)

Mailing List Discussions for CVE-2021-32761 (3)

IV. Related Vulnerabilities

Same product: redis
Same vendor: redis
Same weakness: CWE-125

V. Comments for CVE-2021-32761

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