ArchLinux: 201910-13: pacman: arbitrary command execution

    Date23 Oct 2019
    CategoryArchLinux
    332
    Posted ByLinuxSecurity Advisories
    Archlinux Large
    The package pacman before version 5.2.0-1 is vulnerable to arbitrary command execution.
    Arch Linux Security Advisory ASA-201910-13
    ==========================================
    
    Severity: High
    Date    : 2019-10-23
    CVE-ID  : CVE-2019-18182 CVE-2019-18183
    Package : pacman
    Type    : arbitrary command execution
    Remote  : Yes
    Link    : https://security.archlinux.org/AVG-1049
    
    Summary
    =======
    
    The package pacman before version 5.2.0-1 is vulnerable to arbitrary
    command execution.
    
    Resolution
    ==========
    
    Upgrade to 5.2.0-1.
    
    # pacman -Syu "pacman>=5.2.0-1"
    
    The problems have been fixed upstream in version 5.2.0.
    
    Workaround
    ==========
    
    For CVE-2019-18182:
        Ensure `XferCommand` is commented out in `/etc/pacman.conf`
    
    For CVE-2019-18183:
        Ensure `UseDelta` is commented out in `/etc/pacman.conf`
    
    Description
    ===========
    
    - CVE-2019-18182 (arbitrary command execution)
    
    pacman before 5.2 is vulnerable to arbitrary command injection in
    src/pacman/conf.c in the download_with_xfercommand() function. This can
    be exploited when unsigned databases are used. To exploit the
    vulnerability, the user must enable a non-default XferCommand and
    retrieve an attacker-controlled crafted database and package.
    
    - CVE-2019-18183 (arbitrary command execution)
    
    pacman before 5.2 is vulnerable to arbitrary command injection in
    lib/libalpm/sync.c in the apply_deltas() function. This can be
    exploited when unsigned databases are used. To exploit the
    vulnerability, the user must enable the non-default delta feature and
    retrieve an attacker-controlled crafted database and delta file.
    
    Impact
    ======
    
    A remote attacker is able to execute arbitrary commands on the host
    with a specially crafted database and a package or delta file.
    
    References
    ==========
    
    https://git.archlinux.org/pacman.git/tree/src/pacman/conf.c?h=v5.1.3#n263
    https://git.archlinux.org/pacman.git/commit/?id=808a4f15ce82d2ed7eeb06de73d0f313620558ee
    https://git.archlinux.org/pacman.git/tree/lib/libalpm/sync.c?h=v5.1.3#n767
    https://git.archlinux.org/pacman.git/commit/?id=c0e9be7973be6c81b22fde91516fb8991e7bb07b
    https://security.archlinux.org/CVE-2019-18182
    https://security.archlinux.org/CVE-2019-18183
    
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