Buffer overflow in libass (Alpine package)

1) Buffer overflow

EUVDB-ID: #VU32188

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-2016-7970

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

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

Buffer overflow in the calc_coeff function in libass/ass_blur.c in libass before 0.13.4 allows remote attackers to cause a denial of service via unspecified vectors.

Mitigation

Install update from vendor's website.

Vulnerable software versions

libass (Alpine package): 0.13.0-r0 - 0.13.2-r0

CPE2.3

• cpe:2.3:a:alpine:libass_alpine_package:0.13.0-r0:*:*:*:*:alpine_linux:*:3.2
• cpe:2.3:a:alpine:libass_alpine_package:0.13.2-r0:*:*:*:*:alpine_linux:*:3.3

External links

https://git.alpinelinux.org/aports/commit/?id=c1846533a801fb147bb1798d7ffc7c2c6390435c
https://git.alpinelinux.org/aports/commit/?id=24e6168f3854d0a1595fe1d0d9b45f9398f563b9
https://git.alpinelinux.org/aports/commit/?id=2688f5da763997e1600d4c3d1b7ea0246f6b539a
https://git.alpinelinux.org/aports/commit/?id=5817f9550cd9518445687dba125fbb3554618c67

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.