Bug 1359777

Summary: php,gd: Out-of-bounds access in output function in gd_gif_out.c
Product: [Other] Security Response Reporter: Adam Mariš <amaris>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED WONTFIX QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: abhgupta, dmcphers, fedora, hhorak, jialiu, jmlich83, jokerman, jorton, kseifried, lmeyer, mmccomas, mskalick, rcollet, sardella, slawomir, tiwillia, varekova, webstack-team
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
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:
Story Points: ---
Clone Of: Environment:
Last Closed: 2016-09-26 19:09:01 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 1359837, 1359839    
Bug Blocks: 1359830    

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.