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Category:   Application (Generic)  >   expat Vendors:   libexpat.org
(FreeBSD Issues Fix for expat) Google Chrome Multiple Bugs Let Remote Users Execute Arbitrary Code, Bypass Same-Origin Restrictions, Obtain Potentially Sensitive Information, and Spoof URLs
SecurityTracker Alert ID:  1033319
SecurityTracker URL:  http://securitytracker.com/id/1033319
CVE Reference:   CVE-2015-1283   (Links to External Site)
Date:  Aug 19 2015
Impact:   Disclosure of authentication information, Disclosure of system information, Disclosure of user information, Execution of arbitrary code via network, Modification of system information, Modification of user information, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   Multiple vulnerabilities were reported in Google Chrome. A remote user can cause arbitrary code to be executed on the target user's system. A remote user can bypass security controls on the target system. A remote user can obtain potentially sensitive information on the target system. A remote user can spoof URLs. A remote user can conduct cross-site scripting attacks. expat is affected.

A remote user can create specially crafted content that, when loaded by the target user, will execute arbitrary code on the target user's system.

A heap overflow may occur in pdfium [CVE-2015-1271].

A heap overflow may occur in pdfium [CVE-2015-1273].

A use-after-free memory error may occur in IndexedDB [CVE-2015-1276].

A heap overflow may occur in pdfium [CVE-2015-1279].

A use-after-free memory error may occur in skia [CVE-2015-1280].

A use-after-free memory error may occur in pdfium [CVE-2015-1282].

A heap overflow may occur in expat [CVE-2015-1283].

A use-after-free memory error may occur in blink [CVE-2015-1284].

A use-after-free memory error may occur during unexpected GPU process termination [CVE-2015-1272].

A use-after-free memory error may occur in accessibility [CVE-2015-1277].

Executable files may run immediately after download due to browser settings [CVE-2015-1274].

The software does not properly filter HTML code from user-supplied input before displaying the input. A remote user can cause arbitrary scripting code to be executed by the target user's browser. The code will originate from an arbitrary site and will run in the security context of that site. As a result, the code will be able to access the target user's cookies (including authentication cookies), if any, associated with the site, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.

Chrome for Android is affected [CVE-2015-1275]. Blink is affected [CVE-2015-1286].

A remote user can bypass content security policy controls on the target system [CVE-2015-1281].

A remote user can bypass same origin policy via CSS [CVE-2015-1287].

A remote user can spoof URLs via pdf files [CVE-2015-1278].

A remote user can read uninitialized memory via ICU [CVE-2015-1270].

A remote user can trigger an information leak in the XSS auditor [CVE-2015-1285].

The system retrieves spell checking dictionaries via HTTP [CVE-2015-1288].

A remote user can supply specially crafted JavaScript to trigger a regular expression error in the V8 engineering and cause the target application to crash [CVE-2015-5605].

Some additional vulnerabilities exist [CVE-2015-1289].

cloudfuzzer, makosoft, Collin Payne, mlafon, sidhpurwala.huzaifa, SkyLined, andrewm.bpi, WangTao (neobyte) of Baidu X-Team, Masato Kinugawa, anonymous, filedescriptor, Atte Kettunen of OUSPG, Chamal de Silva, gazheyes, and mike at michaelruddy.com reported these vulnerabilities.

Impact:   A remote user can create content that, when loaded by the target user, will execute arbitrary code on the target user's system.

A remote user can bypass security controls on the target system.

A remote user can obtain potentially sensitive information on the target system.

A remote user can spoof a URL.

A remote user can access the target user's cookies (including authentication cookies), if any, associated with an arbitrary site, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.

Solution:   FreeBSD has issued a fix for CVE-2015-1283 for expat.

The FreeBSD advisory is available at:

https://security.FreeBSD.org/advisories/FreeBSD-SA-15:20.expat.asc

Vendor URL:  security.FreeBSD.org/advisories/FreeBSD-SA-15:20.expat.asc (Links to External Site)
Cause:   Access control error, Boundary error, Input validation error
Underlying OS:  UNIX (FreeBSD)
Underlying OS Comments:  9.3, 10.1, 10.2

Message History:   This archive entry is a follow-up to the message listed below.
Jul 23 2015 Google Chrome Multiple Bugs Let Remote Users Execute Arbitrary Code, Bypass Same-Origin Restrictions, Obtain Potentially Sensitive Information, and Spoof URLs



 Source Message Contents

Subject:  FreeBSD Security Advisory FreeBSD-SA-15:20.expat

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

=============================================================================
FreeBSD-SA-15:20.expat                                      Security Advisory
                                                          The FreeBSD Project

Topic:          Multiple integer overflows in expat (libbsdxml) XML parser

Category:       contrib
Module:         libbsdxml
Announced:      2015-08-18
Affects:        All supported versions of FreeBSD.
Corrected:      2015-08-18 19:30:05 UTC (stable/10, 10.2-STABLE)
                2015-08-18 19:30:35 UTC (releng/10.1, 10.1-RELEASE-p18)
                2015-08-18 19:30:17 UTC (releng/10.2, 10.2-RC3-p1)
                2015-08-18 19:30:17 UTC (releng/10.2, 10.2-RELEASE-p1)
                2015-08-18 19:30:05 UTC (stable/9, 9.3-STABLE)
                2015-08-18 19:30:35 UTC (releng/9.3, 9.3-RELEASE-p23)
CVE Name:       CVE-2015-1283

For general information regarding FreeBSD Security Advisories,
including descriptions of the fields above, security branches, and the
following sections, please visit <URL:https://security.FreeBSD.org/>.

I.   Background

Expat is an XML parser library written in C.  It is a stream-oriented
parser in which an application registers handlers for things the parser
might find in the XML document (like start tags).

The FreeBSD base system ships libexpat as libbsdxml for components that
need to parse XML data.  Some of these applications use the XML parser
on trusted data from the kernel, for instance the geom(8) configuration
utilities, while other applications, like tar(1), cpio(1), svnlite(1)
and unbound-anchor(8), may use the XML parser on input from network or
the user.

II.  Problem Description

Multiple integer overflows have been discovered in the XML_GetBuffer()
function in the expat library.

III. Impact

The integer overflows may be exploited by using specifically crafted XML
data and lead to infinite loop, or a heap buffer overflow, which results
in a Denial of Service condition, or enables remote attackers to execute
arbitrary code.

IV.  Workaround

No workaround is available, but the problem is only exploitable when the
affected system needs to process data from an untrusted source.

Because the library is used by many third party applications, we advise
system administrators to check and make sure that they have the latest
expat version as well, and restart all third party services, or reboot
the system.

V.   Solution

Perform one of the following:

1) Upgrade your vulnerable system to a supported FreeBSD stable or
release / security branch (releng) dated after the correction date.

A reboot is not required after updating the base system.

2) To update your vulnerable system via a binary patch:

Systems running a RELEASE version of FreeBSD on the i386 or amd64
platforms can be updated via the freebsd-update(8) utility:

# freebsd-update fetch
# freebsd-update install

A reboot is not required after updating the base system.

3) To update your vulnerable system via a source code patch:

The following patches have been verified to apply to the applicable
FreeBSD release branches.

a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.

# fetch https://security.FreeBSD.org/patches/SA-15:20/expat.patch
# fetch https://security.FreeBSD.org/patches/SA-15:20/expat.patch.asc
# gpg --verify expat.patch.asc

b) Apply the patch.  Execute the following commands as root:

# cd /usr/src
# patch < /path/to/patch

c) Recompile the operating system using buildworld and installworld as
described in <URL:https://www.FreeBSD.org/handbook/makeworld.html>.

The FreeBSD base system do not install daemons that uses the library,
therefore, a reboot is not required after updating the base system.

VI.  Correction details

The following list contains the correction revision numbers for each
affected branch.

Branch/path                                                      Revision
- -------------------------------------------------------------------------
stable/9/                                                         r286900
releng/9.3/                                                       r286902
stable/10/                                                        r286900
releng/10.1/                                                      r286902
releng/10.2/                                                      r286901
- -------------------------------------------------------------------------

To see which files were modified by a particular revision, run the
following command, replacing NNNNNN with the revision number, on a
machine with Subversion installed:

# svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base

Or visit the following URL, replacing NNNNNN with the revision number:

<URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>

VII. References

<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-1283>

The latest revision of this advisory is available at
<URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-15:20.expat.asc>
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