CVE-2017-15670

The GNU C Library (aka glibc or libc6) before 2.27 contains an off-by-one error leading to a heap-based buffer overflow in the glob function in glob.c, related to the processing of home directories using the ~ operator followed by a long string.

The DNS stub resolver in the GNU C Library (aka glibc or libc6) before version 2.26, when EDNS support is enabled, will solicit large UDP responses from name servers, potentially simplifying off-path DNS spoofing attacks due to IP fragmentation.(CVE-2017-12132, CVE-2017-12133).

The GNU C Library (aka glibc or libc6) before 2.27 contains an off-by-one error leading to a heap-based buffer overflow (CVE-2017-15670).

The glob function in glob.c in the GNU C Library (aka glibc or libc6) before 2.27, when invoked with GLOB_TILDE, could skip freeing allocated memory when processing the ~ operator with a long user name, potentially leading to a denial of service (memory leak) (CVE-2017-15671).

The glob function in glob.c in the GNU C Library (aka glibc or libc6) before 2.27 contains a buffer overflow during unescaping of user names with the ~ operator (CVE-2017-15804).

As libtirpc is also affected by CVE-2017-12133, it's part of this update.

The DNS stub resolver in the GNU C Library (aka glibc or libc6) before version 2.26, when EDNS support is enabled, will solicit large UDP responses from name servers, potentially simplifying off-path DNS spoofing attacks due to IP fragmentation.(CVE-2017-12132, CVE-2017-12133).

The GNU C Library (aka glibc or libc6) before 2.27 contains an off-by-one error leading to a heap-based buffer overflow (CVE-2017-15670).

The glob function in glob.c in the GNU C Library (aka glibc or libc6) before 2.27, when invoked with GLOB_TILDE, could skip freeing allocated memory when processing the ~ operator with a long user name, potentially leading to a denial of service (memory leak) (CVE-2017-15671).

The glob function in glob.c in the GNU C Library (aka glibc or libc6) before 2.27 contains a buffer overflow during unescaping of user names with the ~ operator (CVE-2017-15804).

As libtirpc is also affected by CVE-2017-12133, it's part of this update.

These are all security issues fixed in the glibc-2.34-1.2 package on the GA media of openSUSE Tumbleweed.

This update for glibc fixes the following issues:

• A privilege escalation bug in the realpath() function has been fixed. [CVE-2018-1000001, bsc#1074293]

• A memory leak and a buffer overflow in the dynamic ELF loader has been fixed. [CVE-2017-1000408, CVE-2017-1000409, bsc#1071319]

• An issue in the code handling RPATHs was fixed that could have been exploited by an attacker to execute code loaded from arbitrary libraries. [CVE-2017-16997, bsc#1073231]

• A potential crash caused by a use-after-free bug in pthread_create() has been fixed. [bsc#1053188]

• A bug that prevented users to build shared objects which use the optimized libmvec.so API has been fixed. [bsc#1070905]

• A memory leak in the glob() function has been fixed. [CVE-2017-15670, CVE-2017-15671, CVE-2017-15804, bsc#1064569, bsc#1064580, bsc#1064583]

• A bug that would lose the syscall error code value in case of crashes has been fixed. [bsc#1063675]

This update for glibc fixes the following issues:

Security issues fixed:

• CVE-2017-15804: Fix buffer overflow during unescaping of user names in the glob function in glob.c (bsc#1064580).
• CVE-2017-15670: Fix buffer overflow in glob with GLOB_TILDE (bsc#1064583).
• CVE-2017-15671: Fix memory leak in glob with GLOB_TILDE (bsc#1064569).
• CVE-2018-11236: Fix 32bit arch integer overflow in stdlib/canonicalize.c when processing very long pathname arguments (bsc#1094161).
• CVE-2017-12132: Reduce advertised EDNS0 buffer size to guard against fragmentation attacks (bsc#1051791).

This update for glibc fixes the following issues:

Security issues fixed:

• CVE-2017-15804: Fix buffer overflow during unescaping of user names in the glob function in glob.c (bsc#1064580).
• CVE-2017-15670: Fix buffer overflow in glob with GLOB_TILDE (bsc#1064583).
• CVE-2017-15671: Fix memory leak in glob with GLOB_TILDE (bsc#1064569).
• CVE-2018-11236: Fix 32bit arch integer overflow in stdlib/canonicalize.c when processing very long pathname arguments (bsc#1094161).
• CVE-2017-12132: Reduce advertised EDNS0 buffer size to guard against fragmentation attacks (bsc#1051791).
• CVE-2018-1000001: Avoid underflow of malloced area (bsc#1074293).

This update for glibc fixes the following security issues:

• CVE-2017-15670: Prevent off-by-one error that lead to a heap-based buffer overflow in the glob function, related to the processing of home directories using the ~ operator followed by a long string (bsc#1064583)
• CVE-2017-15804: The glob function contained a buffer overflow during unescaping of user names with the ~ operator (bsc#1064580)
• CVE-2015-5180: res_query in libresolv allowed remote attackers to cause a denial of service (NULL pointer dereference and process crash) (bsc#941234).

This non-security issue was fixed:

• Fix inaccuracies in casin, cacos, casinh, cacosh (bsc#1058774)

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)