[USN-2985-2] GNU C Library regression

Fabricante: Ubuntu
Fecha: 26/05/2016
Identificador: USN-2985-2
[USN-2985-2] GNU C Library regression
========================================================================== Ubuntu Security Notice USN-2985-2 May 26, 2016 eglibc, glibc regression ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 15.10 - Ubuntu 14.04 LTS - Ubuntu 12.04 LTS Summary: USN-2985-1 introduced a regression in the GNU C Library. Software Description: - glibc: GNU C Library - eglibc: GNU C Library Details: USN-2985-1 fixed vulnerabilities in the GNU C Library. The fix for CVE-2014-9761 introduced a regression which affected applications that use the libm library but were not fully restarted after the upgrade. This update removes the fix for CVE-2014-9761 and a future update will be provided to address this issue. We apologize for the inconvenience. Original advisory details: Martin Carpenter discovered that pt_chown in the GNU C Library did not properly check permissions for tty files. A local attacker could use this to gain administrative privileges or expose sensitive information. (CVE-2013-2207, CVE-2016-2856) Robin Hack discovered that the Name Service Switch (NSS) implementation in the GNU C Library did not properly manage its file descriptors. An attacker could use this to cause a denial of service (infinite loop). (CVE-2014-8121) Joseph Myers discovered that the GNU C Library did not properly handle long arguments to functions returning a representation of Not a Number (NaN). An attacker could use this to cause a denial of service (stack exhaustion leading to an application crash) or possibly execute arbitrary code. (CVE-2014-9761) Arjun Shankar discovered that in certain situations the nss_dns code in the GNU C Library did not properly account buffer sizes when passed an unaligned buffer. An attacker could use this to cause a denial of service or possibly execute arbitrary code. (CVE-2015-1781) Sumit Bose and Lukas Slebodnik discovered that the Name Service Switch (NSS) implementation in the GNU C Library did not handle long lines in the files databases correctly. A local attacker could use this to cause a denial of service (application crash) or possibly execute arbitrary code. (CVE-2015-5277) Adam Nielsen discovered that the strftime function in the GNU C Library did not properly handle out-of-range argument data. An attacker could use this to cause a denial of service (application crash) or possibly expose sensitive information. (CVE-2015-8776) Hector Marco and Ismael Ripoll discovered that the GNU C Library allowed the pointer-guarding protection mechanism to be disabled by honoring the LD_POINTER_GUARD environment variable across privilege boundaries. A local attacker could use this to exploit an existing vulnerability more easily. (CVE-2015-8777) Szabolcs Nagy discovered that the hcreate functions in the GNU C Library did not properly check its size argument, leading to an integer overflow. An attacker could use to cause a denial of service (application crash) or possibly execute arbitrary code. (CVE-2015-8778) Maksymilian Arciemowicz discovered a stack-based buffer overflow in the catopen function in the GNU C Library when handling long catalog names. An attacker could use this to cause a denial of service (application crash) or possibly execute arbitrary code. (CVE-2015-8779) Florian Weimer discovered that the getnetbyname implementation in the GNU C Library did not properly handle long names passed as arguments. An attacker could use to cause a denial of service (stack exhaustion leading to an application crash). (CVE-2016-3075) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 15.10: libc-bin 2.21-0ubuntu4.3 libc6 2.21-0ubuntu4.3 libc6-dev 2.21-0ubuntu4.3 Ubuntu 14.04 LTS: libc-bin 2.19-0ubuntu6.9 libc6 2.19-0ubuntu6.9 libc6-dev 2.19-0ubuntu6.9 Ubuntu 12.04 LTS: libc-bin 2.15-0ubuntu10.15 libc6 2.15-0ubuntu10.15 libc6-dev 2.15-0ubuntu10.15 After a standard system update you need to reboot your computer to make all the necessary changes. References: http://www.ubuntu.com/usn/usn-2985-2 http://www.ubuntu.com/usn/usn-2985-1 https://launchpad.net/bugs/1585614 Package Information: https://launchpad.net/ubuntu/+source/glibc/2.21-0ubuntu4.3 https://launchpad.net/ubuntu/+source/eglibc/2.19-0ubuntu6.9 https://launchpad.net/ubuntu/+source/eglibc/2.15-0ubuntu10.15 --