NULL pointer dereference in faad2 (Alpine package)

1) NULL pointer dereference

EUVDB-ID: #VU33385

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 - NULL Pointer Dereference

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

Install update from vendor's website.

Vulnerable software versions

faad2 (Alpine package): 2.7-r7 - 2.8.8-r0

CPE2.3

• cpe:2.3:a:alpine:faad2_alpine_package:2.7-r7:*:*:*:*:alpine_linux:*:3.6
• cpe:2.3:a:alpine:faad2_alpine_package:2.7-r8:*:*:*:*:alpine_linux:*:3.9
• cpe:2.3:a:alpine:faad2_alpine_package:2.8.8-r0:*:*:*:*:alpine_linux:*:3.9

External links

https://git.alpinelinux.org/aports/commit/?id=345e3811719177be2d2edbf507a394cf92cfccb6
https://git.alpinelinux.org/aports/commit/?id=3a9fa508128d243abee97ef41bd84a7847515f61
https://git.alpinelinux.org/aports/commit/?id=e84bc7cecdbbd1563791416fd42384b047dc8c52
https://git.alpinelinux.org/aports/commit/?id=fc0275095ee7d946a66d1f1e4713a943ccc05b78
https://git.alpinelinux.org/aports/commit/?id=3f110aff54a0ff10332ae53c70a0fdc4fbd9f4ec

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.