PT-2019-19820 · Libav · Libav

Published 2019-09-19 · Updated 2021-07-21 · CVE-2019-9720

Positive Technologies (AI Summary)

CVSS v2.0

7.1

High

Base vector

AV:N/AC:M/Au:N/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions Libav version 12.3

Description A stack-based buffer overflow in the subtitle decoder allows attackers to corrupt the stack via a crafted video file in Matroska format. This issue arises because the srt to ass function in libavcodec/srtdec.c misuses snprintf.

Recommendations For Libav version 12.3, consider disabling the subtitle decoder or restricting the use of crafted video files in Matroska format until a patch is available. As a temporary workaround, avoid using the srt to ass function in libavcodec/srtdec.c to minimize the risk of exploitation.

Exploit

Fix

Memory Corruption

Weakness Enumeration

CWE-787

Related Identifiers

CVE-2019-9720

Affected Products

Libav

References · 7

• 🔥 https://github.com/libav/libav/blob/df744e3cf66548c9167ea857104a29d2ea92819e/libavcodec/srtdec.c#L161 · Exploit
• https://osv.dev/vulnerability/CVE-2019-9720 · Vendor Advisory
• https://ubuntu.com/security/CVE-2019-9720 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2019-9720 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2019-9720 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2019-9720 · Vendor Advisory
• https://lgtm.com/security · Note