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    ArchLinux: 202009-5: gnupg: arbitrary code execution

    Date 09 Sep 2020
    245
    Posted By LinuxSecurity Advisories
    The package gnupg before version 2.2.23-1 is vulnerable to arbitrary code execution.
    Arch Linux Security Advisory ASA-202009-5
    =========================================
    
    Severity: Critical
    Date    : 2020-09-07
    CVE-ID  : CVE-2020-25125
    Package : gnupg
    Type    : arbitrary code execution
    Remote  : Yes
    Link    : https://security.archlinux.org/AVG-1218
    
    Summary
    =======
    
    The package gnupg before version 2.2.23-1 is vulnerable to arbitrary
    code execution.
    
    Resolution
    ==========
    
    Upgrade to 2.2.23-1.
    
    # pacman -Syu "gnupg>=2.2.23-1"
    
    The problem has been fixed upstream in version 2.2.23.
    
    Workaround
    ==========
    
    None.
    
    Description
    ===========
    
    Importing an OpenPGP key having a preference list for AEAD algorithms
    will lead to an array overflow and thus often to a crash or other
    undefined behaviour.
    
    Importing an arbitrary key can often easily be triggered by an attacker
    and thus triggering this bug. Exploiting the bug aside from crashes is
    not trivial but likely possible for a dedicated attacker.  The major
    hurdle for an attacker is that only every second byte is under their
    control with every first byte having a fixed value of 0x04.
    
    Software distribution verification should not be affected by this bug
    because such a system uses a curated list of keys.
    
    Impact
    ======
    
    A remote attacker might be able to execute arbitrary code by tricking a
    legitimate user into importing a crafted OpenPGP key.
    
    References
    ==========
    
    https://lists.gnupg.org/pipermail/gnupg-announce/2020q3/000448.html
    https://dev.gnupg.org/T5050
    https://security.archlinux.org/CVE-2020-25125
    

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