CVE-2020-36430
Published: 20 July 2021
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.
Notes
| Author | Note |
|---|---|
| ccdm94 | introduced by commit 910211f. |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
libass Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(code not present)
|
| focal |
Not vulnerable
(code not present)
|
|
| groovy |
Ignored
(reached end-of-life)
|
|
| hirsute |
Ignored
(reached end-of-life)
|
|
| impish |
Not vulnerable
(1:0.15.0-2)
|
|
| jammy |
Not vulnerable
(1:0.15.2-1)
|
|
| trusty |
Not vulnerable
(code not present)
|
|
| upstream |
Released
(0.15.1, 1:0.15.0-2)
|
|
| xenial |
Not vulnerable
(code not present)
|
|
|
Patches: upstream: https://github.com/libass/libass/commit/017137471d0043e0321e377ed8da48e45a3ec632 |
||
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.8 |
| Attack vector | Local |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | Required |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | High |
| Vector | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
References
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-36430
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=26674
- https://github.com/google/oss-fuzz-vulns/blob/main/vulns/libass/OSV-2020-2099.yaml
- https://github.com/libass/libass/commit/017137471d0043e0321e377ed8da48e45a3ec632
- NVD
- Launchpad
- Debian