ArchLinux: 202002-4: ksh: arbitrary command execution

    Date12 Feb 2020
    351
    Posted ByLinuxSecurity Advisories
    The package ksh before version 2020.0.0-2 is vulnerable to arbitrary command execution.
    Arch Linux Security Advisory ASA-202002-4
    =========================================
    
    Severity: High
    Date    : 2020-02-08
    CVE-ID  : CVE-2019-14868
    Package : ksh
    Type    : arbitrary command execution
    Remote  : No
    Link    : https://security.archlinux.org/AVG-1095
    
    Summary
    =======
    
    The package ksh before version 2020.0.0-2 is vulnerable to arbitrary
    command execution.
    
    Resolution
    ==========
    
    Upgrade to 2020.0.0-2.
    
    # pacman -Syu "ksh>=2020.0.0-2"
    
    The problem has been fixed upstream but no release is available yet.
    
    Workaround
    ==========
    
    None.
    
    Description
    ===========
    
    A flaw was found in ksh version 2020.0.0 in the evaluation of certain
    environment variables. An attacker could use this flaw to override or
    bypass environment restrictions to execute shell commands. Services and
    applications that allow remote unauthenticated attackers to provide one
    of those environment variables could allow them to exploit this issue
    remotely.
    
    Impact
    ======
    
    An attacker is able to execute arbitrary commands that are blacklisted
    on the affected host.
    
    References
    ==========
    
    https://github.com/att/ast/commit/c7de8b641266bac7c77942239ac659edfee9ecd2
    https://security.archlinux.org/CVE-2019-14868
    
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