Bug 1452549 – CVE-2017-9048 libxml2: Stack-based buffer overflow in function xmlSnprintfElementContent

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Bug 1452549 - (CVE-2017-9048) CVE-2017-9048 libxml2: Stack-based buffer overflow in function xmlSnprintfElementContent

Summary:	CVE-2017-9048 libxml2: Stack-based buffer overflow in function xmlSnprintfEle...

Status:	CLOSED WONTFIX

Aliases:	CVE-2017-9048

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

Priority	low Severity low
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Assigned To:	Red Hat Product Security
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Whiteboard:	impact=low,public=20170515,reported=2...
Keywords:	Security

Depends On:	1548942 1452550 1452551
Blocks:	1452558
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Reported:	2017-05-19 03:54 EDT by Andrej Nemec
Modified:	2018-04-24 08:42 EDT (History)
CC List:	19 users (show)

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Last Closed:	2018-02-26 00:10:17 EST
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Description Andrej Nemec 2017-05-19 03:54:30 EDT

libxml2 is vulnerable to a stack-based buffer overflow. The function xmlSnprintfElementContent in valid.c is supposed to recursively dump the element content definition into a char buffer 'buf' of size 'size'. At the end of the routine, the function may strcat two more characters without checking whether the current strlen(buf) + 2 < size. This vulnerability causes programs that use libxml2 to crash. 

References:

http://seclists.org/oss-sec/2017/q2/258

Comment 1 Andrej Nemec 2017-05-19 03:55:03 EDT

Created libxml2 tracking bugs for this issue:

Affects: fedora-all [bug 1452550]


Created mingw-libxml2 tracking bugs for this issue:

Affects: fedora-all [bug 1452551]

Comment 3 Doran Moppert 2018-02-25 23:48:53 EST

Statement:

This vulnerability exists in the DTD validation functionality of libxml2.  Applications that do not attempt to validate untrusted documents are not impacted.

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