CVE-2018-6485

An integer overflow in the implementation of the posix_memalign in memalign functions in the GNU C Library (aka glibc or libc6) 2.26 and earlier could cause these functions to return a pointer to a heap area that is too small, potentially leading to heap corruption.

• CVE-2018-6485: fix integer overflows in memalign and malloc
• CVE-2018-1000001: fix realpath buffer underflow via getcwd
• CVE-2018-19591: fix if_nametoindex descriptor leak

• CVE-2018-6485: fix integer overflows in memalign and malloc
• CVE-2018-1000001: fix realpath buffer underflow via getcwd
• CVE-2018-19591: fix if_nametoindex descriptor leak

An integer overflow in the implementation of the posix_memalign in memalign functions in the GNU C Library (aka glibc or libc6) 2.26 and earlier could cause these functions to return a pointer to a heap area that is too small, potentially leading to heap corruption (CVE-2018-6485, CVE-2018-6551).

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:

Security issues fixed:

• CVE-2017-8804: Fix memory leak after deserialization failure in xdr_bytes, xdr_string (bsc#1037930)
• CVE-2017-12132: Reduce EDNS payload size to 1200 bytes (bsc#1051791)
• CVE-2018-6485,CVE-2018-6551: Fix integer overflows in internal memalign and malloc functions (bsc#1079036)
• CVE-2018-1000001: Avoid underflow of malloced area (bsc#1074293)

Non security bugs fixed:

• Release read lock after resetting timeout (bsc#1073990)

This update for glibc fixes the following issues:

Security issues:

• CVE-2017-8804: Fix memory leak after deserialization failure in xdr_bytes, xdr_string (bsc#1037930)
• CVE-2017-12132: Reduce EDNS payload size to 1200 bytes (bsc#1051791)
• CVE-2018-6485,CVE-2018-6551: Fix integer overflows in internal memalign and malloc functions (bsc#1079036)
• CVE-2018-1000001: Avoid underflow of malloced area in realpath (bsc#1074293)

Also a non security issue was fixed:

• Do not fail if one of the two responses to AF_UNSPEC fails (bsc#978209)

Jakub Wilk discovered that GNU C Library incorrectly handled certain memory alignments. An attacker could possibly use this issue to execute arbitrary code or cause a crash.

Florian Weimer discovered that the GNU C Library incorrectly handled certain memory operations. A remote attacker could use this issue to cause the GNU C Library to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 16.04 LTS. (CVE-2017-12133)

It was discovered that the GNU C Library incorrectly handled certain SSE2-optimized memmove operations. A remote attacker could use this issue to cause the GNU C Library to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 16.04 LTS. (CVE-2017-18269)

It was discovered that the GNU C Library incorrectly handled certain pathname operations. A remote attacker could use this issue to cause the GNU C Library to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 18.04 LTS. (CVE-2018-11236)

It was discovered that the GNU C Library incorrectly handled certain AVX-512-optimized mempcpy operations. A remote attacker could use this issue to cause the GNU C Library to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 18.04 LTS. (CVE-2018-11237)

It was discovered that the GNU C Library incorrectly handled certain hostname loookups. A remote attacker could use this issue to cause the GNU C Library to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 18.04 LTS. (CVE-2018-19591)

Jakub Wilk discovered that the GNU C Library incorrectly handled certain memalign functions. A remote attacker could use this issue to cause the GNU C Library to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 16.04 LTS. (CVE-2018-6485)

It was discovered that the GNU C Library incorrectly ignored the LD_PREFER_MAP_32BIT_EXEC environment variable after security transitions. A local attacker could use this issue to bypass ASLR restrictions. (CVE-2019-19126)

It was discovered that the GNU C Library incorrectly handled certain regular expressions. A remote attacker could possibly use this issue to cause the GNU C Library to crash, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. (CVE-2019-9169)

It was discovered that the GNU C Library incorrectly handled certain bit patterns. A remote attacker could use this issue to cause the GNU C Library to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. (CVE-2020-10029)

It was discovered that the GNU C Library incorrectly handled certain signal trampolines on PowerPC. A remote attacker could use this issue to cause the GNU C Library to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2020-1751)

It was discovered that the GNU C Library incorrectly handled tilde expansion. A remote attacker could use this issue to cause the GNU C Library to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2020-1752)