High severity · published Jul 20, 2021
CVE-2020-36430
libass 0.15.x before 0.15.1 has a heap-based buffer overflow in decode_chars (called from decode_font and process_text) because the wrong integer data type is used for subtraction
7.8
CVSS
1.1%
EPSS
No
On KEV
Description
libass 0.15.x before 0.15.1 has a heap-based buffer overflow in decode_chars (called from decode_font and process_text) because the wrong integer data type is used for subtraction.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.1% · higher than 65% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FE
Fedora · Fedoraproject
34 · source: NVD
LI
Libass · Libass Project
0.15.0 before 0.15.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-36430
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-36430
Issue Tracking
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=26674
Third Party Advisory
https://github.com/google/oss-fuzz-vulns/blob/main/vulns/libass/OSV-2020-2099.yaml
Patch
https://github.com/libass/libass/commit/017137471d0043e0321e377ed8da48e45a3ec632
lists.fedoraproject.org
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6JUXFQUJ32GWG5E46A63DFDCYJAF3VU6/
Third Party Advisory
https://security.gentoo.org/glsa/202208-13
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