Vulnerability Name:

CVE-2019-9720 (CCN-167346)

Assigned:2019-03-12
Published:2019-03-12
Updated:2021-07-21
Summary:A stack-based buffer overflow in the subtitle decoder in Libav 12.3 allows attackers to corrupt the stack via a crafted video file in Matroska format, because srt_to_ass in libavcodec/srtdec.c misuses snprintf.
CVSS v3 Severity:6.5 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H)
5.7 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H/E:U/RL:U/RC:R)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): Required
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
3.3 Low (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L)
2.9 Low (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L/E:U/RL:U/RC:R)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): Required
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Low
CVSS v2 Severity:7.1 High (CVSS v2 Vector: AV:N/AC:M/Au:N/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Medium
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
1.7 Low (CCN CVSS v2 Vector: AV:L/AC:L/Au:S/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
Vulnerability Type:CWE-120
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2019-9720

Source: XF
Type: UNKNOWN
libav-cve20199720-dos(167346)

Source: MISC
Type: Exploit, Third Party Advisory
https://github.com/libav/libav/blob/df744e3cf66548c9167ea857104a29d2ea92819e/libavcodec/srtdec.c#L161

Source: CCN
Type: LGTM Web site
Security Research and CVEs discovered by Semmle

Source: MISC
Type: Third Party Advisory
https://lgtm.com/security/

Source: CCN
Type: Libav Web site
Libav

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2019-9720

Vulnerable Configuration:Configuration 1:
  • cpe:/a:libav:libav:*:*:*:*:*:*:*:* (Version <= 12.3)

    • Configuration CCN 1:
  • cpe:/a:libav:libav:12.3:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:com.ubuntu.disco:def:201997200000000
    V
    		CVE-2019-9720 on Ubuntu 19.04 (disco) - medium.
    2019-09-19
    oval:com.ubuntu.bionic:def:201997200000000
    V
    		CVE-2019-9720 on Ubuntu 18.04 LTS (bionic) - medium.
    2019-09-19
    oval:com.ubuntu.xenial:def:201997200000000
    V
    		CVE-2019-9720 on Ubuntu 16.04 LTS (xenial) - medium.
    2019-09-19
    BACK
    libav libav *
    libav libav 12.3