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    ArchLinux: 201911-11: linux-lts: arbitrary code execution

    Date
    494
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    The package linux-lts before version 4.19.82-1 is vulnerable to arbitrary code execution.
    Arch Linux Security Advisory ASA-201911-11
    ==========================================
    
    Severity: Critical
    Date    : 2019-11-13
    CVE-ID  : CVE-2019-17666
    Package : linux-lts
    Type    : arbitrary code execution
    Remote  : Yes
    Link    : https://security.archlinux.org/AVG-1065
    
    Summary
    =======
    
    The package linux-lts before version 4.19.82-1 is vulnerable to
    arbitrary code execution.
    
    Resolution
    ==========
    
    Upgrade to 4.19.82-1.
    
    # pacman -Syu "linux-lts>=4.19.82-1"
    
    The problem has been fixed upstream in version 4.19.82.
    
    Workaround
    ==========
    
    When Wi-Fi usage is not required, disabling it mitigates the issue.
    
    Description
    ===========
    
    rtl_p2p_noa_ie in drivers/net/wireless/realtek/rtlwifi/ps.c in the
    Linux kernel before 5.3.9, 4.19.82, 4.14.152, 4.9.199, 4.4.199 lacks a
    certain upper-bound check, leading to a buffer overflow. An attacker is
    able to trigger the overflow remotely through Wi-Fi by using a power-
    saving feature known as a Notice of Absence when the Realtek (RTLWIFI)
    driver is being used on the affected host leading to arbitrary code
    execution.
    
    Impact
    ======
    
    A remote attacker in Wi-Fi range is able to execute arbitrary code when
    the Realtek (RTLWIFI) driver is being used on the affected host.
    
    References
    ==========
    
    https://lkml.org/lkml/2019/10/16/1226
    https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8c55dedb795be8ec0cf488f98c03a1c2176f7fb1
    https://security.archlinux.org/CVE-2019-17666
    
    

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