PT-2021-6688 · Libass+2 · Libsass+2
Published
2021-07-20
·
Updated
2023-02-26
·
CVE-2020-36430
CVSS v2.0
9.3
High
| Vector | AV:N/AC:M/Au:N/C:C/I:C/A:C |
Name of the Vulnerable Software and Affected Versions
libass versions 0.15.x through 0.15.0
Description
The issue is related to the decode chars function of the libass subtitle renderer, which is used for ASS/SSA formats. It involves the use of an incorrect integer data type for subtraction, leading to a heap-based buffer overflow. This can be exploited by a remote attacker to access confidential data, compromise data integrity, and cause a denial of service. The
decode chars function, called from decode font and process text, is specifically affected due to the wrong integer data type used for subtraction.Recommendations
For libass versions 0.15.x through 0.15.0, update to version 0.15.1 or later to resolve the issue. As a temporary workaround, consider restricting access to the
decode chars function until a patch is available.Fix
Memory Corruption
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Weakness Enumeration
Related Identifiers
Affected Products
Alt Linux
Suse
Libsass