#VU48579 Infinite loop in musl libc - CVE-2020-28928

Vulnerability identifier: #VU48579

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-28928

CWE-ID: CWE-835

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
musl libc
Universal components / Libraries / Libraries used by multiple products

Vendor: GNU

Description

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

The vulnerability exists due to infinite loop within the wcsnrtombs() function in musl libc. A remote attacker can consume all available system resources and cause denial of service conditions.

Mitigation
Install update from vendor's website.

Vulnerable software versions

musl libc: 0.5.0 - 1.2.1

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External links
https://seclists.org/oss-sec/2020/q4/152
https://musl.libc.org/releases.html

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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.