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    ArchLinux: 202011-29: musl: arbitrary code execution

    Date 05 Dec 2020
    444
    Posted By LinuxSecurity Advisories
    The package musl before version 1.2.1-2 is vulnerable to arbitrary code execution.
    Arch Linux Security Advisory ASA-202011-29
    ==========================================
    
    Severity: Medium
    Date    : 2020-11-26
    CVE-ID  : CVE-2020-28928
    Package : musl
    Type    : arbitrary code execution
    Remote  : No
    Link    : https://security.archlinux.org/AVG-1287
    
    Summary
    =======
    
    The package musl before version 1.2.1-2 is vulnerable to arbitrary code
    execution.
    
    Resolution
    ==========
    
    Upgrade to 1.2.1-2.
    
    # pacman -Syu "musl>=1.2.1-2"
    
    The problem has been fixed upstream but no release is available yet.
    
    Workaround
    ==========
    
    None.
    
    Description
    ===========
    
    The wcsnrtombs function in all musl libc versions up to 1.2.1 has been
    found to have multiple bugs in the handling of the destination buffer
    size when limiting the input character count, which can lead to an
    infinite loop with no progress (no overflow) or to writing past the end
    of the destination buffer.
    
    Impact
    ======
    
    An attacker might be able to execute arbitrary code via crafted input
    content.
    
    References
    ==========
    
    https://bugs.archlinux.org/task/68685
    https://www.openwall.com/lists/musl/2020/11/19/1
    https://git.musl-libc.org/cgit/musl/commit/?id=3ab2a4e02682df1382955071919d8aa3c3ec40d4
    https://security.archlinux.org/CVE-2020-28928
    

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