Mageia 2019-0349: glibc security update

    Date30 Nov 2019
    CategoryMageia
    142
    Posted ByLinuxSecurity Advisories
    Updated glibc packages fixes the following security issue: On the x86-64 architecture, the GNU C Library (aka glibc) before 2.31 fails to ignore the LD_PREFER_MAP_32BIT_EXEC environment variable during program execution after a security transition, allowing local
    MGASA-2019-0349 - Updated glibc packages fix security vulnerability
    
    Publication date: 30 Nov 2019
    URL: https://advisories.mageia.org/MGASA-2019-0349.html
    Type: security
    Affected Mageia releases: 7
    CVE: CVE-2019-19126
    
    Updated glibc packages fixes the following security issue:
    
    On the x86-64 architecture, the GNU C Library (aka glibc) before 2.31
    fails to ignore the LD_PREFER_MAP_32BIT_EXEC environment variable
    during program execution after a security transition, allowing local
    attackers to restrict the possible mapping addresses for loaded
    libraries and thus bypass ASLR for a setuid program (CVE-2019-19126).
    
    Other upstream fixes in this update:
    - Call _dl_open_check after relocation [BZ #24259]
    - support: Export bindir path on support_path
    - nss_db: fix endent wrt NULL mappings [BZ #24695] [BZ #24696]
    - elf: Refuse to dlopen PIE objects [BZ #24323]
    - Fix alignment of TLS variables for tls variant TLS_TCB_AT_TP [BZ #23403]
    - Fix assertion in malloc.c:tcache_get
    - Small tcache improvements
    - malloc: Remove unwanted leading whitespace in malloc_info [BZ #24867]
    - malloc: Fix missing accounting of top chunk in malloc_info [BZ #24026]
    - Add glibc.malloc.mxfast tunable
    - malloc: Various cleanups for malloc/tst-mxfast
    - Base max_fast on alignment, not width, of bins [BZ #24903]
    - Linux: Use in-tree copy of SO_ constants for !__USE_MISC [BZ #24532]
    
    References:
    - https://bugs.mageia.org/show_bug.cgi?id=25756
    - https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-19126
    
    SRPMS:
    - 7/core/glibc-2.29-19.mga7
    

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