Ubuntu Security Notice 3424-2 - USN-3424-1 fixed several vulnerabilities in libxml2. This update provides the corresponding update for Ubuntu 12.04 ESM. A It was discovered that a type confusion error existed in libxml2. An A attacker could use this to specially construct XML data that A could cause a denial of service or possibly execute arbitrary A code. Various other issues were also addressed.
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Ubuntu Security Notice USN-3424-2
October 10, 2017
libxml2 vulnerabilities
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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:
A It was discovered that a type confusion error existed in libxml2. An
A attacker could use this to specially construct XML data that
A could cause a denial of service or possibly execute arbitrary
A code. (CVE-2017-0663)
A It was discovered that libxml2 did not properly validate parsed entity
A references. An attacker could use this to specially construct XML
A data that could expose sensitive information. (CVE-2017-7375)
A It was discovered that a buffer overflow existed in libxml2 when
A handling HTTP redirects. An attacker could use this to specially
A construct XML data that could cause a denial of service or possibly
A execute arbitrary code. (CVE-2017-7376)
A Marcel BAPhme and Van-Thuan Pham discovered a buffer overflow in
A libxml2 when handling elements. An attacker could use this to
A specially construct XML data that could cause a denial of service or
A possibly execute arbitrary code. (CVE-2017-9047)
A Marcel BAPhme and Van-Thuan Pham discovered a buffer overread
A in libxml2 when handling elements. An attacker could use this
A to specially construct XML data that could cause a denial of
A service. (CVE-2017-9048)
A Marcel BAPhme and Van-Thuan Pham discovered multiple buffer overreads
A in libxml2 when handling parameter-entity references. An attacker
A could use these to specially construct XML data that could cause a
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:
A libxml2A A A A A A A A A A A A A A A A A A A A A A A A A 2.7.8.dfsg-5.1ubuntu4.18
In general, a standard system update will make all the necessary
changes.
References:
A https://www.ubuntu.com/usn/usn-3424-2
A https://www.ubuntu.com/usn/usn-3424-1
A CVE-2017-0663, CVE-2017-7375, CVE-2017-7376, CVE-2017-9047,
A CVE-2017-9048, CVE-2017-9049, CVE-2017-9050