CVE-2017-15671

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).

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.

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 issues:

Security issue fixed:

• CVE-2017-15671: Fixed memory leak in glob with GLOB_TILDE (bsc#1064569, BZ #22325).

Non-security issue fixed:

• Avoid access beyond memory bounds in pthread_attr_getaffinity_np (bsc#1110170, BZ #15618).
• Remove improper assert in dlclose (bsc#1110174, BZ #11941).