Bug 1340856 – CVE-2016-5116 gd: Information leak due to stack overflow in gdCtxPrintf

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Bug 1340856 - (CVE-2016-5116) CVE-2016-5116 gd: Information leak due to stack overflow in gdCtxPrintf

Summary:	CVE-2016-5116 gd: Information leak due to stack overflow in gdCtxPrintf

Status:	NEW

Aliases:	CVE-2016-5116

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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Assigned To:	Red Hat Product Security
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Whiteboard:	impact=moderate,public=20160529,repor...
Keywords:	Security

Depends On:	1340857
Blocks:
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Reported:	2016-05-30 08:34 EDT by Andrej Nemec
Modified:	2018-06-29 18:08 EDT (History)
CC List:	12 users (show)

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Description Andrej Nemec 2016-05-30 08:34:24 EDT

While creating an XBM image (imagexbm) with an user supplied name,
libgd isn't checking the vsnprintf return value and PHP 5.5 will trust
this length and read more memory than it should, causing a read-out-of
boundaries, leaking stack memory.

References:

http://seclists.org/oss-sec/2016/q2/428

External references:

https://github.com/libgd/libgd/issues/211

Upstream fix:

https://github.com/libgd/libgd/commit/4dc1a2d7931017d3625f2d7cff70a17ce58b53b4

Comment 1 Andrej Nemec 2016-05-30 08:35:48 EDT

Created gd tracking bugs for this issue:

Affects: fedora-all [bug 1340857]

Comment 2 Fedora Update System 2016-06-02 10:55:08 EDT

gd-2.1.1-6.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.

Comment 3 Fedora Update System 2016-06-17 11:50:29 EDT

gd-2.1.1-4.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.

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