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    ArchLinux: 202004-4: linux: privilege escalation

    Date
    446
    Posted By
    The package linux before version 5.5.13.arch2-1 is vulnerable to privilege escalation.
    Arch Linux Security Advisory ASA-202004-4
    =========================================
    
    Severity: High
    Date    : 2020-04-01
    CVE-ID  : CVE-2020-8835
    Package : linux
    Type    : privilege escalation
    Remote  : No
    Link    : https://security.archlinux.org/AVG-1122
    
    Summary
    =======
    
    The package linux before version 5.5.13.arch2-1 is vulnerable to
    privilege escalation.
    
    Resolution
    ==========
    
    Upgrade to 5.5.13.arch2-1.
    
    # pacman -Syu "linux>=5.5.13.arch2-1"
    
    The problem has been fixed upstream in version 5.5.13.arch2.
    
    Workaround
    ==========
    
    BPF access can be restricted to privileged users by setting
    kernel.unprivileged_bpf_disabled to 1:
    
    # sysctl -w kernel.unprivileged_bpf_disabled=1
    
    Description
    ===========
    
    An out-of-bounds access flaw was found in the Linux kernel’s
    implementation of the eBPF code verifier, where an incorrect register
    bounds calculation while checking 32-bit instructions in an eBPF
    program occurs. This flaw allows an unprivileged user or process to
    execute eBPF programs to crash the kernel, resulting in a denial of
    service or potentially gaining root privileges on the system.
    
    Impact
    ======
    
    An unprivileged local user or process can crash the kernel, resulting
    in a denial of service, or potentially gain root privileges on the
    system.
    
    References
    ==========
    
    https://www.thezdi.com/blog/2020/3/19/pwn2own-2020-day-one-results
    https://lore.kernel.org/bpf/This email address is being protected from spambots. You need JavaScript enabled to view it./T/
    https://www.openwall.com/lists/oss-security/2020/03/30/3
    https://security.archlinux.org/CVE-2020-8835
    
    

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