Out-of-bounds read in libass - CVE-2016-7969
Published: March 3, 2017 / Updated: July 28, 2020
Vulnerability identifier: #VU32187
CSH Severity: Medium
CVSS v4: 8.7 [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]
CVE-ID: CVE-2016-7969
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
The wrap_lines_smart function in ass_render.c in libass before 0.13.4 allows remote attackers to cause a denial of service (out-of-bounds read) via unspecified vectors, related to "0/3 line wrapping equalization."
Affected software
libass
Gentoo Linux
Fedora
libass (Alpine package)
media-libs/libass
libass
Gentoo Linux
Fedora
libass (Alpine package)
media-libs/libass
libass
How to mitigate CVE-2016-7969
Install update from vendor's website.
libass - update to 0.13.4
libass (Alpine package) - update to 0.12.2-r1
media-libs/libass - update to 0.13.4
libass - addressed in versions 0.13.4-1.el7, 0.13.4-1.fc23, 0.13.4-1.fc24, 0.13.4-1.fc25
libass (Alpine package) - update to 0.12.2-r1
media-libs/libass - update to 0.13.4
libass - addressed in versions 0.13.4-1.el7, 0.13.4-1.fc23, 0.13.4-1.fc24, 0.13.4-1.fc25
External References
- http://lists.opensuse.org/opensuse-updates/2016-12/msg00068.html
- http://www.openwall.com/lists/oss-security/2016/10/05/2
- http://www.securityfocus.com/bid/93358
- https://bugzilla.redhat.com/show_bug.cgi?id=1381960
- https://github.com/libass/libass/pull/240/commits/b72b283b936a600c730e00875d7d067bded3fc26
- 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