CVE-2024-33870

A flaw was found in Ghostscript. When the `gp_validate_path_len` function validates a path, it distinguishes between absolute and relative paths. In the case of relative paths, it will check the path with and without the current-directory-prefix ("foo" and "./foo"). This does not take into account paths with a parent-directory-prefix. Therefore, a path like "../../foo" is also tested as "./../../foo" and if the current directory "./" is in the permitted paths, it will pass the check, which may allow arbitrary file access.

It was discovered that Ghostscript did not properly restrict eexec seeds to those specified by the Type 1 Font Format standard when SAFER mode is used. An attacker could use this issue to bypass SAFER restrictions and cause unspecified impact. This issue only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, and Ubuntu 23.10. Thomas Rinsma discovered that Ghostscript did not prevent changes to uniprint device argument strings after SAFER is activated, resulting in a format-string vulnerability. An attacker could possibly use this to execute arbitrary code.