Bug 1359777 - php,gd: Out-of-bounds access in output function in gd_gif_out.c
Summary: php,gd: Out-of-bounds access in output function in gd_gif_out.c
Keywords:
Status: CLOSED WONTFIX
Alias: None
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: 1359837 1359839
Blocks: 1359830
TreeView+ depends on / blocked
 
Reported: 2016-07-25 12:40 UTC by Adam Mariš
Modified: 2019-09-29 13:53 UTC (History)
18 users (show)

Fixed In Version: php 5.5.38, php 5.6.24, php 7.0.9
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2016-09-26 19:09:01 UTC
Embargoed:

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Description Adam Mariš 2016-07-25 12:40:31 UTC 
It was found that output function from gd_gif_out.c causes out-of-bounds access of the masks array when ctx->cur_bits becomes a negative number.

PHP bug:

https://bugs.php.net/bug.php?id=72519

PHP fix:

https://git.php.net/?p=php-src.git;a=blobdiff;f=ext/gd/libgd/gd_gif_out.c;h=0178dd9741dc4d9f0a956b99670a5838a2f7b22b;hp=14045385ab834abe2c3183f48a6a32dd3a2a19f2;hb=a48f64c403b05da244cfd30399bffd53e910a440;hpb=210222928e52b95827a0b5e4a987303233597f89
Comment 1 Adam Mariš 2016-07-25 14:11:44 UTC 
Created gd tracking bugs for this issue:

Affects: fedora-all [bug 1359839]
Comment 2 Adam Mariš 2016-07-25 14:11:55 UTC 
Created php tracking bugs for this issue:

Affects: fedora-all [bug 1359837]
Comment 3 Stefan Cornelius 2016-09-26 18:56:34 UTC 
Out-of-bounds read of a global buffer. I can't see any real impact on security here.
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