MGASA-2022-0052 - Updated glibc packages fix security vulnerability

Publication date: 08 Feb 2022
URL: https://advisories.mageia.org/MGASA-2022-0052.html
Type: security
Affected Mageia releases: 8
CVE: CVE-2021-3999

Updated glibc packages fix security vulnerability:

An off-by-one buffer overflow and underflow in getcwd() may lead to memory
corruption when the size of the buffer is exactly 1. A local attacker who
can control the input buffer and size passed to getcwd() in a setuid program
could use this flaw to potentially execute arbitrary code and escalate their
privileges on the system (CVE-2021-3999).

Other upstream fixes in this update:
- gconv: Do not emit spurious NUL character in ISO-2022-JP-3 [BZ #28524]
- x86: Fix __wcsncmp_avx2 in strcmp-avx2.S [BZ #28755]
- x86: Set Prefer_No_VZEROUPPER and add Prefer_AVX2_STRCMP
- x86-64: Add ifunc-avx2.h functions with 256-bit EVEX
- x86-64: Add strcpy family functions with 256-bit EVEX
- x86-64: Add memmove family functions with 256-bit EVEX
- x86-64: Add memset family functions with 256-bit EVEX
- x86-64: Add memcmp family functions with 256-bit EVEX
- x86-64: Add AVX optimized string/memory functions for RTM
- x86: Add string/memory function tests in RTM region
- x86-64: Use ZMM16-ZMM31 in AVX512 memset family functions
- x86-64: Use ZMM16-ZMM31 in AVX512 memmove family functions
- test-strnlen.c: Initialize wchar_t string with wmemset [BZ #27655]
- test-strnlen.c: Check that strnlen won't go beyond the maximum length
- x86: Optimize memchr-avx2.S
- x86: Fix overflow bug with wmemchr-sse2 and wmemchr-avx2 [BZ #27974]
- x86: Optimize strlen-avx2.S
- x86: Optimize memchr-evex.S
- x86-64: Fix an unknown vector operation in memchr-evex.S
- x86-64: Move strlen.S to multiarch/strlen-vec.S
- x86-64: Add wcslen optimize for sse4.1
- x86: Fix overflow bug in wcsnlen-sse4_1 and wcsnlen-avx2 [BZ #27974]
- x86: Optimize strlen-evex.S
- String: Add overflow tests for strnlen, memchr, and strncat [BZ #27974]
- x86-64: Require BMI2 for __strlen_evex and __strnlen_evex
- x86: Check RTM_ALWAYS_ABORT for RTM [BZ #28033]
- x86: Black list more Intel CPUs for TSX [BZ #27398]
- x86: Remove wcsnlen-sse4_1 from wcslen ifunc-impl-list [BZ #28064]
- x86-64: Test strlen and wcslen with 0 in the RSI register [BZ #28064]

References:
- https://bugs.mageia.org/show_bug.cgi?id=29935
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3999

SRPMS:
- 8/core/glibc-2.32-25.mga8