ESB-2017.2376.2 - UPDATE [Win][UNIX/Linux][Ubuntu] libxml2: Multiple vulnerabilities 2017-10-11

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                              ESB-2017.2376.2
                          libxml2 vulnerabilities
                              11 October 2017

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           libxml2
Publisher:         Ubuntu
Operating System:  Ubuntu
                   UNIX variants (UNIX, Linux, OSX)
                   Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Denial of Service               -- Remote/Unauthenticated
                   Access Confidential Data        -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-9050 CVE-2017-9049 CVE-2017-9048
                   CVE-2017-9047 CVE-2017-7376 CVE-2017-7375
                   CVE-2017-0663  

Reference:         ASB-2017.0080
                   ESB-2017.2376
                   ESB-2017.2122

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3424-1
   http://www.ubuntu.com/usn/usn-3424-2

Revision History:  October   11 2017: Additional product
                   September 20 2017: Initial Release

- --------------------------BEGIN INCLUDED TEXT--------------------

==========================================================================
Ubuntu Security Notice USN-3424-1
September 19, 2017

libxml2 vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- - Ubuntu 17.04
- - Ubuntu 16.04 LTS
- - Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in libxml2.

Software Description:
- - libxml2: GNOME XML library

Details:

It was discovered that a type confusion error existed in libxml2. An
attacker could use this to specially construct XML data that
could cause a denial of service or possibly execute arbitrary
code. (CVE-2017-0663)

It was discovered that libxml2 did not properly validate parsed entity
references. An attacker could use this to specially construct XML
data that could expose sensitive information. (CVE-2017-7375)

It was discovered that a buffer overflow existed in libxml2 when
handling HTTP redirects. An attacker could use this to specially
construct XML data that could cause a denial of service or possibly
execute arbitrary code. (CVE-2017-7376)

Marcel Bohme and Van-Thuan Pham discovered a buffer overflow in
libxml2 when handling elements. An attacker could use this to specially
construct XML data that could cause a denial of service or possibly
execute arbitrary code. (CVE-2017-9047)

Marcel Bohme and Van-Thuan Pham discovered a buffer overread
in libxml2 when handling elements. An attacker could use this
to specially construct XML data that could cause a denial of
service. (CVE-2017-9048)

Marcel Bohme and Van-Thuan Pham discovered multiple buffer overreads
in libxml2 when handling parameter-entity references. An attacker
could use these to specially construct XML data that could cause a
denial of service. (CVE-2017-9049, CVE-2017-9050)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 17.04:
  libxml2                         2.9.4+dfsg1-2.2ubuntu0.1

Ubuntu 16.04 LTS:
  libxml2                         2.9.3+dfsg1-1ubuntu0.3

Ubuntu 14.04 LTS:
  libxml2                         2.9.1+dfsg1-3ubuntu4.10

In general, a standard system update will make all the necessary changes.

References:
  https://www.ubuntu.com/usn/usn-3424-1
  CVE-2017-0663, CVE-2017-7375, CVE-2017-7376, CVE-2017-9047,
  CVE-2017-9048, CVE-2017-9049, CVE-2017-9050

Package Information:
  https://launchpad.net/ubuntu/+source/libxml2/2.9.4+dfsg1-2.2ubuntu0.1
  https://launchpad.net/ubuntu/+source/libxml2/2.9.3+dfsg1-1ubuntu0.3
  https://launchpad.net/ubuntu/+source/libxml2/2.9.1+dfsg1-3ubuntu4.10

==========================================================================
Ubuntu Security Notice USN-3424-2
October 10, 2017

libxml2 vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- - Ubuntu 12.04 ESM

Summary:

Several security issues were fixed in libxml2.

Software Description:
- - libxml2: GNOME XML library

Details:

USN-3424-1 fixed several vulnerabilities in libxml2. This update
provides the corresponding update for Ubuntu 12.04 ESM.

Original advisory details:

It was discovered that a type confusion error existed in libxml2. An
attacker could use this to specially construct XML data that
could cause a denial of service or possibly execute arbitrary
code. (CVE-2017-0663)

It was discovered that libxml2 did not properly validate parsed entity
references. An attacker could use this to specially construct XML
data that could expose sensitive information. (CVE-2017-7375)

It was discovered that a buffer overflow existed in libxml2 when
handling HTTP redirects. An attacker could use this to specially
construct XML data that could cause a denial of service or possibly
execute arbitrary code. (CVE-2017-7376)

Marcel Bohme and Van-Thuan Pham discovered a buffer overflow in
libxml2 when handling elements. An attacker could use this to
specially construct XML data that could cause a denial of service or
possibly execute arbitrary code. (CVE-2017-9047)

Marcel Bohme and Van-Thuan Pham discovered a buffer overread
in libxml2 when handling elements. An attacker could use this
to specially construct XML data that could cause a denial of
service. (CVE-2017-9048)

Marcel Bohme and Van-Thuan Pham discovered multiple buffer overreads
in libxml2 when handling parameter-entity references. An attacker
could use these to specially construct XML data that could cause a
denial of service. (CVE-2017-9049, CVE-2017-9050)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 12.04 ESM:
libxml2 2.7.8.dfsg-5.1ubuntu4.18

In general, a standard system update will make all the necessary
changes.

References:
 https://www.ubuntu.com/usn/usn-3424-2
 https://www.ubuntu.com/usn/usn-3424-1
 CVE-2017-0663, CVE-2017-7375, CVE-2017-7376, CVE-2017-9047,
 CVE-2017-9048, CVE-2017-9049, CVE-2017-9050


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