9.3 - USN-3534-1

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

- Ubuntu 17.10 - Ubuntu 16.04 LTS - Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in the GNU C library.

Software Description: - glibc: GNU C Library - eglibc: GNU C Library

Details:

It was discovered that the GNU C library did not properly handle all of the possible return values from the kernel getcwd(2) syscall. A local attacker could potentially exploit this to execute arbitrary code in setuid programs and gain administrative privileges. (CVE-2018-1000001)

A memory leak was discovered in the _dl_init_paths() function in the GNU C library dynamic loader. A local attacker could potentially exploit this with a specially crafted value in the LD_HWCAP_MASK environment variable, in combination with CVE-2017-1000409 and another vulnerability on a system with hardlink protections disabled, in order to gain administrative privileges. (CVE-2017-1000408)

A heap-based buffer overflow was discovered in the _dl_init_paths() function in the GNU C library dynamic loader. A local attacker could potentially exploit this with a specially crafted value in the LD_LIBRARY_PATH environment variable, in combination with CVE-2017-1000408 and another vulnerability on a system with hardlink protections disabled, in order to gain administrative privileges. (CVE-2017-1000409)

An off-by-one error leading to a heap-based buffer overflow was discovered in the GNU C library glob() implementation. An attacker could potentially exploit this to cause a denial of service or execute arbitrary code via a maliciously crafted pattern. (CVE-2017-15670)

A heap-based buffer overflow was discovered during unescaping of user names with the ~ operator in the GNU C library glob() implementation. An attacker could potentially exploit this to cause a denial of service or execute arbitrary code via a maliciously crafted pattern. (CVE-2017-15804)

It was discovered that the GNU C library dynamic loader mishandles RPATH and RUNPATH containing $ORIGIN for privileged (setuid or AT_SECURE) programs. A local attacker could potentially exploit this by providing a specially crafted library in the current working directory in order to gain administrative privileges. (CVE-2017-16997)

It was discovered that the GNU C library malloc() implementation could return a memory block that is too small if an attempt is made to allocate an object whose size is close to SIZE_MAX, resulting in a heap-based overflow. An attacker could potentially exploit this to cause a denial of service or execute arbitrary code. This issue only affected Ubuntu 17.10. (CVE-2017-17426)

Update instructions:

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

Ubuntu 17.10:
libc6 2.26-0ubuntu2.1

Ubuntu 16.04 LTS:
libc6 2.23-0ubuntu10

Ubuntu 14.04 LTS:
libc6 2.19-0ubuntu6.14

After a standard system update you need to reboot your computer to make all the necessary changes.

References:
https://www.ubuntu.com/usn/usn-3534-1
CVE-2017-1000408, CVE-2017-1000409, CVE-2017-15670, CVE-2017-15804,
CVE-2017-16997, CVE-2017-17426, CVE-2018-1000001

Package Information:
https://launchpad.net/ubuntu/+source/glibc/2.26-0ubuntu2.1
https://launchpad.net/ubuntu/+source/glibc/2.23-0ubuntu10
https://launchpad.net/ubuntu/+source/eglibc/2.19-0ubuntu6.14