#VU32035 Resource management error in libass - CVE-2016-7972

Vulnerability identifier: #VU32035

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-2016-7972

CWE-ID: CWE-399

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
libass
Other software / Other software solutions

Vendor: libass

Description

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

The check_allocations function in libass/ass_shaper.c in libass before 0.13.4 allows remote attackers to cause a denial of service (memory allocation failure) via unspecified vectors.

Mitigation
Install update from vendor's website.

Vulnerable software versions

libass: 0.13.0 - 0.13.3

---

External links
https://lists.opensuse.org/opensuse-updates/2016-12/msg00068.html
https://www.openwall.com/lists/oss-security/2016/10/05/2
https://www.securityfocus.com/bid/93358
https://bugzilla.redhat.com/show_bug.cgi?id=1381960
https://github.com/libass/libass/pull/240/commits/aa54e0b59200a994d50a346b5d7ac818ebcf2d4b
https://github.com/libass/libass/releases/tag/0.13.4
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KW6DNERYHPI5Y6SQYU3XKTVSCOWMIHUC/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/R7JJ2SGVOX6UQQIRMVC3QACJLKHE2PYN/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VUOUOK3VULMMZTNSCRFCNPDAPDWAVK7X/
https://security.gentoo.org/glsa/201702-25

---

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.