Bug 1870257 (CVE-2020-16305) - CVE-2020-16305 ghostscript: buffer overflow in pcx_write_rle() in contrib/japanese/gdev10v.c could result in a DoS
Summary: CVE-2020-16305 ghostscript: buffer overflow in pcx_write_rle() in contrib/jap...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2020-16305
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1870260 1872501 1872502
Blocks: 1870273
TreeView+ depends on / blocked
 
Reported: 2020-08-19 15:34 UTC by Michael Kaplan
Modified: 2021-05-18 20:35 UTC (History)
7 users (show)

Fixed In Version: ghostscript 9.51
Doc Type: If docs needed, set a value
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Clone Of:
Environment:
Last Closed: 2021-05-18 20:35:51 UTC


Attachments (Terms of Use)

Description Michael Kaplan 2020-08-19 15:34:05 UTC
A buffer overflow vulnerability in pcx_write_rle() in contrib/japanese/gdev10v.c of Artifex Software GhostScript v9.50 allows a remote attacker to cause a denial of service via a crafted PDF file. This is fixed in v9.51.

References:

https://bugs.ghostscript.com/show_bug.cgi?id=701819
https://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=2793769ff107d8d22dadd30c6e68cd781b569550

Comment 1 Michael Kaplan 2020-08-19 15:34:52 UTC
Created ghostscript tracking bugs for this issue:

Affects: fedora-all [bug 1870260]

Comment 2 Todd Cullum 2020-08-25 22:36:40 UTC
Flaw summary:

Incorrect if statement conditional order in pcx_write_rle() could allow the dereference of an out-of-bounds pointer `from`. This is possible because there is a while loop in which `from` is incremented before the line:

if (data != *from || from == end)

Therefore, it's possible that from is incremented past the end of the buffer and then dereferenced in the first comparison. The patch reverses these comparisons to ensure that is not possible.

Comment 5 errata-xmlrpc 2021-05-18 15:37:18 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:1852 https://access.redhat.com/errata/RHSA-2021:1852

Comment 6 Product Security DevOps Team 2021-05-18 20:35:51 UTC
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2020-16305


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