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    ArchLinux: 202011-17: rclone: private key recovery

    Date 29 Nov 2020
    434
    Posted By LinuxSecurity Advisories
    The package rclone before version 1.53.3-1 is vulnerable to private key recovery.
    Arch Linux Security Advisory ASA-202011-17
    ==========================================
    
    Severity: Medium
    Date    : 2020-11-19
    CVE-ID  : CVE-2020-28924
    Package : rclone
    Type    : private key recovery
    Remote  : No
    Link    : https://security.archlinux.org/AVG-1286
    
    Summary
    =======
    
    The package rclone before version 1.53.3-1 is vulnerable to private key
    recovery.
    
    Resolution
    ==========
    
    Upgrade to 1.53.3-1.
    
    # pacman -Syu "rclone>=1.53.3-1"
    
    The problem has been fixed upstream in version 1.53.3.
    
    Workaround
    ==========
    
    All passwords generated by rclone 1.49.0 up to 1.53.2 should be
    changed. Rclone provides a password checker to find weak passwords as a
    separate tool called passwordcheck.
    
    Description
    ===========
    
    An issue was discovered in rclone 1.49.0 up to 1.53.2. Due to the use
    of a weak random number generator, the password generator has been
    producing weak passwords with much less entropy than advertised. The
    suggested passwords depend deterministically on the time rclone was
    started. This limits the entropy of the passwords enormously. These
    passwords are often used in the crypt backend for encryption of data.
    It would be possible to make a dictionary of all possible passwords
    with about 38 million entries per password length. This would make
    decryption of secret material possible with a plausible amount of
    effort. NOTE: all passwords generated by affected versions should be
    changed.
    
    Impact
    ======
    
    A malicious user might be able to brute force the weak passwords.
    
    References
    ==========
    
    https://github.com/rclone/rclone/issues/4783
    https://github.com/rclone/rclone/commit/7985df37681f54d013816a4641da4f9b085b3aa5
    https://github.com/rclone/passwordcheck
    https://security.archlinux.org/CVE-2020-28924
    

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