ArchLinux: 202004-2: linux-hardened: privilege escalation

    Date 01 Apr 2020
    233
    Posted By LinuxSecurity Advisories
    The package linux-hardened before version 5.5.13.b-1 is vulnerable to privilege escalation.
    Arch Linux Security Advisory ASA-202004-2
    =========================================
    
    Severity: High
    Date    : 2020-04-01
    CVE-ID  : CVE-2020-8835
    Package : linux-hardened
    Type    : privilege escalation
    Remote  : No
    Link    : https://security.archlinux.org/AVG-1120
    
    Summary
    =======
    
    The package linux-hardened before version 5.5.13.b-1 is vulnerable to
    privilege escalation.
    
    Resolution
    ==========
    
    Upgrade to 5.5.13.b-1.
    
    # pacman -Syu "linux-hardened>=5.5.13.b-1"
    
    The problem has been fixed upstream in version 5.5.13.b.
    
    Workaround
    ==========
    
    By default linux-hardened is safe as it restricts BPF access to
    privileged users. In case the kernel.unprivileged_bpf_disabled setting
    has been explicitly changed, it can be restricted again:
    
    # 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 in case the default BPF access has been changed to allow
    unprivileged users.
    
    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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