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Bug 1416066 - (CVE-2017-5502) CVE-2017-5502 jasper: Left shift of negative value in jp2_validate() in jp2_dec.c
CVE-2017-5502 jasper: Left shift of negative value in jp2_validate() in jp2_d...
Status: CLOSED NOTABUG
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
low Severity low
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Assigned To: Red Hat Product Security
impact=low,public=20161028,reported=2...
: Security
Depends On:
Blocks: 1449402
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Reported: 2017-01-24 09:03 EST by Andrej Nemec
Modified: 2017-05-09 17:35 EDT (History)
20 users (show)

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Last Closed: 2017-03-13 17:59:28 EDT
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Description Andrej Nemec 2017-01-24 09:03:44 EST 
A vulnerability was found in jasper. A crafted file could cause a left shift of negative value.

References:

http://seclists.org/oss-sec/2017/q1/101
Comment 1 Andrej Nemec 2017-01-24 09:23:44 EST 
Created mingw-jasper tracking bugs for this issue:

Affects: epel-7 [bug 1406409]
Comment 2 Andrej Nemec 2017-01-24 09:23:57 EST 
Created jasper tracking bugs for this issue:

Affects: epel-5 [bug 1406406]
Comment 3 Tomas Hoger 2017-03-13 17:49:22 EDT 
Upstream bug report:

https://github.com/mdadams/jasper/issues/76

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/00030-jasper-leftshift-jp2_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/jp2/jp2_dec.c:485:49: runtime error: left shift of negative value -26

CVE: CVE-2017-5502
Comment 4 Tomas Hoger 2017-03-13 17:59:28 EDT 
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.  ubsan findings may indicate a relevant bug, but does not seem to have any other security impact.
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