Bug 1443940 – CVE-2017-7975 jbig2dec: Integer overflow in jbig2_build_huffman_table allows OOB write

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Bug 1443940 - (CVE-2017-7975) CVE-2017-7975 jbig2dec: Integer overflow in jbig2_build_huffman_table allows OOB write

Summary:	CVE-2017-7975 jbig2dec: Integer overflow in jbig2_build_huffman_table allows ...

Status:	CLOSED WONTFIX

Aliases:	CVE-2017-7975

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	medium Severity medium
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Target Release:	---
Assigned To:	Red Hat Product Security
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URL:
Whiteboard:	impact=moderate,public=20170327,repor...
Keywords:	Security

Depends On:	1443898 1443899 1443933 1443934
Blocks:	1443943
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Reported:	2017-04-20 06:00 EDT by Adam Mariš
Modified:	2017-07-19 12:08 EDT (History)
CC List:	8 users (show)

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Last Closed:	2017-07-19 12:08:15 EDT
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Description Adam Mariš 2017-04-20 06:00:35 EDT

Artifex jbig2dec 0.13, as used in Ghostscript, allows out-of-bounds writes because of an integer overflow in the jbig2_build_huffman_table function in jbig2_huffman.c during operations on a crafted JBIG2 file, leading to a denial of service (application crash) or possibly execution of arbitrary code.

Upstream bug:

https://bugs.ghostscript.com/show_bug.cgi?id=697693

Comment 1 Adam Mariš 2017-04-20 06:00:50 EDT

Acknowledgments:

Name: Jiaqi Peng (Chinese Academy of Sciences)

Comment 2 Andrej Nemec 2017-04-20 11:09:39 EDT

Created jbig2dec tracking bugs for this issue:

Affects: epel-all [bug 1443899]

Comment 4 Cedric Buissart 2017-07-10 05:57:04 EDT

Note: in 64 bits environment, OOB write concerns only the 0xffffffffxxxxxxxx range. This range is at best read-only, thus would not lead to a possible arbitrary code execution.

Comment 6 Cedric Buissart 2017-07-19 04:42:35 EDT

Reducing impact to low based on comment 4.

Comment 9 Cedric Buissart 2017-07-19 12:05:50 EDT

The vulnerability requires user defined Huffman table for the vulnerability to be triggered. ghostscript versions prior to 9.00 are not be affected by this vulnerability.
As a result, 
* RHEL-7 is shipped with only the 64 bit version of ghostscript, and is only vulnerable to DoS
* RHEL-5 & 6 are not affected.

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