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    ArchLinux: 202011-19: libass: arbitrary code execution

    Date 29 Nov 2020
    442
    Posted By LinuxSecurity Advisories
    The package libass before version 0.15.0-1 is vulnerable to arbitrary code execution.
    Arch Linux Security Advisory ASA-202011-19
    ==========================================
    
    Severity: Medium
    Date    : 2020-11-19
    CVE-ID  : CVE-2020-26682
    Package : libass
    Type    : arbitrary code execution
    Remote  : No
    Link    : https://security.archlinux.org/AVG-1285
    
    Summary
    =======
    
    The package libass before version 0.15.0-1 is vulnerable to arbitrary
    code execution.
    
    Resolution
    ==========
    
    Upgrade to 0.15.0-1.
    
    # pacman -Syu "libass>=0.15.0-1"
    
    The problem has been fixed upstream in version 0.15.0.
    
    Workaround
    ==========
    
    None.
    
    Description
    ===========
    
    In libass 0.14.0, the ass_outline_construct's call to outline_stroke
    causes a signed integer overflow.
    
    Impact
    ======
    
    A maliciously crafted file might crash the application or execute
    arbitrary code.
    
    References
    ==========
    
    https://github.com/libass/libass/issues/431
    https://github.com/libass/libass/pull/432
    https://github.com/libass/libass/commit/676f9dc5b52ef406c5527bdadbcb947f11392929
    https://security.archlinux.org/CVE-2020-26682
    

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