Synopsis

Low: glibc security, bug fix, and enhancement update

Type/Severity

Security Advisory: Low

Topic

An update for glibc is now available for Red Hat Enterprise Linux 8.

Red Hat Product Security has rated this update as having a security impact of Low. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

The glibc packages provide the standard C libraries (libc), POSIX thread libraries (libpthread), standard math libraries (libm), and the name service cache daemon (nscd) used by multiple programs on the system. Without these libraries, the Linux system cannot function correctly.

Security Fix(es):

• glibc: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid binaries (CVE-2019-19126)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.2 Release Notes linked from the References section.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

For the update to take effect, all services linked to the glibc library must be restarted, or the system rebooted.

Affected Products

• Red Hat Enterprise Linux for x86_64 8 x86_64
• Red Hat Enterprise Linux for IBM z Systems 8 s390x
• Red Hat Enterprise Linux for Power, little endian 8 ppc64le
• Red Hat Enterprise Linux for ARM 64 8 aarch64
• Red Hat CodeReady Linux Builder for x86_64 8 x86_64
• Red Hat CodeReady Linux Builder for Power, little endian 8 ppc64le
• Red Hat CodeReady Linux Builder for ARM 64 8 aarch64
• Red Hat CodeReady Linux Builder for IBM z Systems 8 s390x

Fixes

• BZ - 1361965 - glibc: Fix C.UTF-8 locale source ellipsis expressions
• BZ - 1410154 - glibc: Incomplete rollback of dynamic linker state on dlopen failure (NODELETE bug)
• BZ - 1682954 - glibc: Call _dl_open_check (CET related) after relocation is finished
• BZ - 1726638 - glibc: Implement SVE Vector PCS on AArch64
• BZ - 1735747 - glibc: malloc_info updates
• BZ - 1746928 - glibc: Avoid fork handler lock for async-signal-safe fork
• BZ - 1746933 - glibc: Backport malloc tcache enhancements (swbz#24531)
• BZ - 1747453 - glibc: Add --preload option to the dynamic loader
• BZ - 1747502 - glibc: Calling getpwent after endpwent should not crash?
• BZ - 1747505 - glibc: Add a comment to the default nscd.conf file that is it not recommended to use NSCD and SSSD for the same NSS maps
• BZ - 1749439 - glibc: Repeating pututxline() on EINTR/EAGAIN causes stale utmp entries
• BZ - 1764214 - glibc: Fix alignment of TLS variables for tls variant TLS_TCB_AT_TP
• BZ - 1764218 - glibc: Backport malloc fastbin (mxfast) enhancements
• BZ - 1764223 - glibc: elf: Refuse to dlopen PIE objects [BZ #24323]
• BZ - 1764226 - glibc: Various test suite enhancements
• BZ - 1764231 - glibc: ld.so: Support moving versioned symbols between sonames [BZ #24741]
• BZ - 1764234 - glibc: Update system call names list to Linux 5.3
• BZ - 1764235 - glibc: malloc: Set and reset all hooks for tracing (Bug 16573)
• BZ - 1764238 - glibc: Enhancements for GCC Toolset enablement
• BZ - 1764241 - glibc: libio: Remove codecvt vtable [BZ #24588]
• BZ - 1764242 - glibc: Enhancements for LLVM toolset
• BZ - 1769304 - glibc: Backport more precise tokenizer for installed headers test
• BZ - 1774681 - CVE-2019-19126 glibc: LD_PREFER_MAP_32BIT_EXEC not ignored in setuid binaries
• BZ - 1775294 - glibc: Avoid invalid __has_include in <sys/stat.h>
• BZ - 1777241 - glibc: z15 (s390x) strstr implementation can return incorrect result if search string cross page boundary

CVEs

• CVE-2019-19126

References