#VU33385 NULL pointer dereference - CVE-2018-20362

Vulnerability identifier: #VU33385

Vulnerability risk: Medium

CVSSv4.0: 4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2018-20362

CWE-ID: CWE-476

Exploitation vector: Local

Exploit availability: No

Description

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

The vulnerability exists due to a NULL pointer dereference error in ifilter_bank of libfaad/filtbank.c in Freeware Advanced Audio Decoder 2 (FAAD2) 2.8.8. The vulnerability causes a segmentation fault and application crash because adding to windowed output is mishandled in the EIGHT_SHORT_SEQUENCE case. A remote attacker can perform a denial of service (DoS) attack.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

External links
https://github.com/knik0/faad2/issues/26
https://lists.debian.org/debian-lts-announce/2019/05/msg00022.html
https://seclists.org/bugtraq/2019/Sep/28
https://security.gentoo.org/glsa/202006-17
https://www.debian.org/security/2019/dsa-4522

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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