ArchLinux: 201901-4: systemd: multiple issues

    Date11 Jan 2019
    CategoryArchLinux
    705
    Posted ByLinuxSecurity Advisories
    The package systemd before version 240.0-3 is vulnerable to multiple issues including arbitrary file overwrite and information disclosure.
    Arch Linux Security Advisory ASA-201901-4
    =========================================
    
    Severity: Medium
    Date    : 2019-01-08
    CVE-ID  : CVE-2018-6954 CVE-2018-16866
    Package : systemd
    Type    : multiple issues
    Remote  : No
    Link    : https://security.archlinux.org/AVG-615
    
    Summary
    =======
    
    The package systemd before version 240.0-3 is vulnerable to multiple
    issues including arbitrary file overwrite and information disclosure.
    
    Resolution
    ==========
    
    Upgrade to 240.0-3.
    
    # pacman -Syu "systemd>=240.0-3"
    
    The problems have been fixed upstream in version 240.0.
    
    Workaround
    ==========
    
    None.
    
    Description
    ===========
    
    - CVE-2018-6954 (arbitrary file overwrite)
    
    systemd-tmpfiles in systemd through 237 mishandles symlinks present in
    non-terminal path components, which allows local users to obtain
    ownership of arbitrary files via vectors involving creation of a
    directory and a file under that directory, and later replacing that
    directory with a symlink. This occurs even if the fs.protected_symlinks
    sysctl is turned on.
    
    - CVE-2018-16866 (information disclosure)
    
    An out-of-bounds read has been found in the journald component of
    systemd >= v221 and < v240, in the syslog_parse_identifier() function
    in journald-syslog.c. A crafted syslog message whose last character is
    ':' can trigger this vulnerability to leak information about the
    content of the memory.
    
    Impact
    ======
    
    A local attacker is able to obtain ownership of arbitrary files or
    disclose information using a specially crafted syslog message.
    
    References
    ==========
    
    https://github.com/systemd/systemd/issues/7986
    https://github.com/systemd/systemd/pull/8822
    https://www.qualys.com/2019/01/09/system-down/system-down.txt
    https://www.openwall.com/lists/oss-security/2019/01/09/3
    https://github.com/systemd/systemd/commit/a6aadf4ae0bae185dc4c414d492a4a781c80ffe5
    https://github.com/systemd/systemd/commit/8595102d3ddde6d25c282f965573a6de34ab4421
    https://security.archlinux.org/CVE-2018-6954
    https://security.archlinux.org/CVE-2018-16866
    
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