#VU84474 Reachable Assertion in Redis - CVE-2021-31294

Vulnerability identifier: #VU84474

Vulnerability risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-31294

CWE-ID: CWE-617

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Redis
Server applications / Database software

Vendor: Redis Labs

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to Redis allows a replica to cause an assertion failure in a primary server. A remote attacker can send a non-administrative command (specifically, a SET command) to perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Redis: 1.3.6 - 1.3.12, 2.0.0 - 2.0.5, 2.2.0 - 2.2.15, 2.4.0 - 2.4.18, 2.6.0 - 2.6.17, 2.8.0 - 2.8.24, 3.0.0 - 3.0.7, 3.2.0 - 3.2.13, 4.0.0 - 4.0.14, 5.0.0 - 5.0.14, 6.0.0 - 6.0.1

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External links
https://github.com/redis/redis/commit/46f4ebbe842620f0976a36741a72482620aa4b48
https://github.com/redis/redis/commit/6cbea7d29b5285692843bc1c351abba1a7ef326f
https://github.com/redis/redis/issues/8712
https://security.netapp.com/advisory/ntap-20230814-0007/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.