A memory corruption issue was found in Artifex Ghostscript 9.50 and 9.52. Use of a non-standard PostScript operator can allow overriding of file access controls. The 'rsearch' calculation for the 'post' size resulted in a size that was too large, and could underflow to max uint32_t. This was fixed in commit 5d499272b95a6b890a1397e11d20937de000d31b.
The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result.
| Link | Tags |
|---|---|
| http://git.ghostscript.com/?p=ghostpdl.git%3Ba=log | |
| https://github.com/ArtifexSoftware/ghostpdl/commits/master/psi/zstring.c | third party advisory patch |
| https://git.ghostscript.com/?p=ghostpdl.git%3Ba=commitdiff%3Bh=5d499272b95a6b890a1397e11d20937de000d31b | |
| https://github.com/ArtifexSoftware/ghostpdl/commit/5d499272b95a6b890a1397e11d20937de000d31b | third party advisory patch |
| https://artifex.com/security-advisories/CVE-2020-15900 | vendor advisory |
| http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00004.html | vendor advisory mailing list third party advisory |
| http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00006.html | vendor advisory mailing list third party advisory |
| https://usn.ubuntu.com/4445-1/ | third party advisory vendor advisory |
| https://security.gentoo.org/glsa/202008-20 | third party advisory vendor advisory |