Bug 1416063 (CVE-2017-5500)

Summary:	CVE-2017-5500 jasper: Invalid exponent shift in jpc_calcabsstepsize() in jpc_dec.c
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	bmcclain, cfergeau, dblechte, eedri, erik-fedora, jridky, lsurette, mgoldboi, michal.skrivanek, mike, rbalakri, rdieter, rh-spice-bugs, rjones, sherold, slawomir, srevivo, ykaul, ylavi
Target Milestone:	---	Keywords:	Security
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Hardware:	All
OS:	Linux
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Last Closed:	2017-03-13 22:32:35 UTC	Type:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
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Embargoed:
Bug Depends On:
Bug Blocks:	1449402

Description Andrej Nemec 2017-01-24 14:01:01 UTC

A vulnerability was found in jasper. A crafted file could cause a crash via invalid exponent shift.

References:

http://seclists.org/oss-sec/2017/q1/101

Comment 1 Andrej Nemec 2017-01-24 14:22:49 UTC

Created mingw-jasper tracking bugs for this issue:

Affects: epel-7 [bug 1406409]

Comment 2 Andrej Nemec 2017-01-24 14:23:05 UTC

Created jasper tracking bugs for this issue:

Affects: epel-5 [bug 1406406]

Comment 3 Tomas Hoger 2017-03-13 22:30:28 UTC

Upstream bug report:

https://github.com/mdadams/jasper/issues/64

This issue has not been resolved upstream yet (the current upstream version is 2.0.12).

Reporter's advisory:

https://blogs.gentoo.org/ago/2017/01/16/jasper-multiple-crashes-with-ubsan/

Relevant information from the advisory:

With the undefined behavior sanitizer enabled, jasper crashes showing some left shift and some signed integer overflow.

...

Affected version / Tested on: 1.900.17
Fixed version: N/A
Commit fix: N/A

Reproducer:
https://github.com/asarubbo/poc/blob/master/00019-jasper-leftshift-jpc_dec_c

Relevant part of the stacktrace:

# imginfo -f $FILE
/tmp/portage/media-libs/jasper-1.900.17/work/jasper-1.900.17/src/libjasper/jpc/jpc_dec.c:1819:40: runtime error: shift exponent 117 is too large for 64-bit type 'jpc_fix_t' (aka 'long')

CVE: CVE-2017-5500

Comment 4 Tomas Hoger 2017-03-13 22:32:35 UTC

The important information form the advisory is that this crash only occurs when jasper is compiles with undefined behaviour sanitizer (ubsan) enabled.  That is a development tool aimed to identify possible code bugs related to undefined behaviour.  There is no crash as described by this CVE in builds not using ubsan.