#VU63043 Out-of-bounds read in libsndfile - CVE-2021-4156

Vulnerability identifier: #VU63043

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-4156

CWE-ID: CWE-125

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
libsndfile
Client/Desktop applications / Multimedia software

Vendor: Erik de Castro Lopo

Description

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

The vulnerability exists due to a boundary condition within the flac_read_loop() function in flac.c. A remote attacker can pass specially crafted data to the application, trigger an out-of-bounds read error and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

libsndfile: 1.0.0 rc1 - 1.0.31

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External links
https://bugzilla.redhat.com/show_bug.cgi?id=2027690
https://github.com/libsndfile/libsndfile/pull/732/commits/4c30646abf7834e406f7e2429c70bc254e18beab
https://github.com/libsndfile/libsndfile/issues/731

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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.