Bug 1232805 – CVE-2015-3228 ghostscript-core: out-of-bounbds read and write in gs_ttf.ps

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Bug 1232805 - (CVE-2015-3228) CVE-2015-3228 ghostscript-core: out-of-bounbds read and write in gs_ttf.ps

Summary:	CVE-2015-3228 ghostscript-core: out-of-bounbds read and write in gs_ttf.ps

Status:	CLOSED WONTFIX

Aliases:	CVE-2015-3228

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	low Severity low
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	impact=low,public=20150723,reported=2...
Keywords:	Security

Depends On:
Blocks:	1232808
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Reported:	2015-06-17 10:06 EDT by Vasyl Kaigorodov
Modified:	2016-01-22 05:05 EST (History)
CC List:	15 users (show)

See Also:
Fixed In Version:	GhostScript 9.10
Doc Type:	Bug Fix
Doc Text:	An integer overflow flaw was discovered in one of Ghostscript's memory allocation routines. A remote attacker could possibly exploit this flaw to cause a crash or, potentially, execute arbitrary code by tricking a user into processing a specially crafted file.
Story Points:	---
Clone Of:
Environment:
Last Closed:	2015-10-16 09:11:45 EDT
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
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oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
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Description Vasyl Kaigorodov 2015-06-17 10:06:58 EDT

Out-of-bounbds read and write has been reported in GhostScript package while processing a crafted .ps file.

Upstream bug: http://bugs.ghostscript.com/show_bug.cgi?id=696041
Upstream commit that fixes this (as per reporter): http://git.ghostscript.com/?p=ghostpdl.git;a=commit;h=ecc7a199e9307475c37fea0c44d24b85df814ead 

Acknowledgements:

Red Hat would like to thank William Robinet of Conostix S.A. for reporting this issue.

Comment 2 Stefan Cornelius 2015-06-30 11:25:52 EDT

I believe that the root issue is actually an integer overflow in one of
the memory allocation routines.

gs_heap_alloc_bytes() function in base/gsmalloc.c:
>        uint added = size + sizeof(gs_malloc_block_t);
>
>        if (mmem->limit - added < mmem->used)
>            set_msg("exceeded limit");
>        else if ((ptr = (byte *) Memento_label(malloc(added), cname)) == 0)
>            set_msg("failed");


If "size" is very large, then size+sizeof(gs_malloc_block_t) can cause
a wrap-around and "size" will suddenly be a lot smaller than it
actually needs to be.

Comment 3 Stefan Cornelius 2015-07-08 06:51:53 EDT

Upstream patch:
http://git.ghostscript.com/?p=ghostpdl.git;a=commitdiff;h=0c0b0859

Comment 4 Martin Prpič 2015-07-24 03:25:39 EDT

Public via:

http://openwall.com/lists/oss-security/2015/07/23/14

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