Bug 1985246 (CVE-2020-36430) - CVE-2020-36430 libass: heap-based buffer overflow in decode_chars because the wrong integer data type is used for subtraction
Summary: CVE-2020-36430 libass: heap-based buffer overflow in decode_chars because the...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2020-36430
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1985248 1985247
Blocks:
TreeView+ depends on / blocked
 
Reported: 2021-07-23 08:52 UTC by Marian Rehak
Modified: 2021-10-28 05:28 UTC (History)
2 users (show)

Fixed In Version:
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Last Closed: 2021-10-28 05:28:38 UTC


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Description Marian Rehak 2021-07-23 08:52:06 UTC
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.

References:

https://github.com/libass/libass/commit/017137471d0043e0321e377ed8da48e45a3ec632
https://github.com/google/oss-fuzz-vulns/blob/main/vulns/libass/OSV-2020-2099.yaml
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=26674

Comment 1 Marian Rehak 2021-07-23 08:52:41 UTC
Created libass tracking bugs for this issue:

Affects: epel-all [bug 1985248]
Affects: fedora-all [bug 1985247]


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