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