CVE-2020-15900: Integer Underflow
First published: Tue Jul 28 2020(Updated: )
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.
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Artifex Ghostscript | =9.50 | |
| Artifex Ghostscript | =9.52 | |
| Canonical Ubuntu Linux | =20.04 | |
| openSUSE Leap | =15.1 | |
| openSUSE Leap | =15.2 | |
| ubuntu/ghostscript | <9.50~dfsg-5ubuntu4.1 | 9.50~dfsg-5ubuntu4.1 |
| debian/ghostscript | 9.53.3~dfsg-7+deb11u7 10.0.0~dfsg-11+deb12u4 10.0.0~dfsg-11+deb12u5 10.03.1~dfsg-2 |
Remedy
https://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=5d499272b95a6b890a1397e11d20937de000d31b
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Reference Links
- http://git.ghostscript.com/?p=ghostpdl.git;a=log
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00004.html
- http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00006.html
- https://artifex.com/security-advisories/CVE-2020-15900
- https://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=5d499272b95a6b890a1397e11d20937de000d31b
- https://github.com/ArtifexSoftware/ghostpdl/commit/5d499272b95a6b890a1397e11d20937de000d31b
- https://github.com/ArtifexSoftware/ghostpdl/commits/master/psi/zstring.c
- https://security.gentoo.org/glsa/202008-20
- https://usn.ubuntu.com/4445-1/
- https://launchpad.net/bugs/cve/CVE-2020-15900
- http://git.ghostscript.com/?p=ghostpdl.git%3Ba=log
- https://git.ghostscript.com/?p=ghostpdl.git%3Ba=commitdiff%3Bh=5d499272b95a6b890a1397e11d20937de000d31b
- https://bugs.ghostscript.com/show_bug.cgi?id=702582
- https://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=7ecbfda92b4c8dbf6f6c2bf8fc82020a29219eff
- https://security-tracker.debian.org/tracker/CVE-2020-15900
- https://ubuntu.com/security/notices/USN-4445-1
- https://www.cve.org/CVERecord?id=CVE-2020-15900
- https://nvd.nist.gov/vuln/detail/CVE-2020-15900
- https://ubuntu.com/security/CVE-2020-15900
Frequently Asked Questions
What is CVE-2020-15900?
CVE-2020-15900 is a memory corruption vulnerability found in Artifex Ghostscript 9.50 and 9.52.
What is the severity of CVE-2020-15900?
The severity of CVE-2020-15900 is critical with a CVSS score of 9.8.
What is the affected software of CVE-2020-15900?
The affected software includes Artifex Ghostscript versions 9.50 and 9.52, as well as Ubuntu Linux 20.04 and openSUSE Leap 15.1/15.2.
How can the vulnerability be exploited?
The vulnerability can be exploited by using a non-standard PostScript operator to override file access controls.
Is there a fix available for CVE-2020-15900?
Yes, there are fixes available. Please refer to the provided references for more information on the fixes.
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