Ubuntu 0053-1: Linux kernel vulnerability

    Date29 Jul 2019
    CategoryUbuntu
    915
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Kernel Live Patch Security Notice 0053-1
    July 23, 2019
    
    linux vulnerability
    ==========================================================================
    
    A security issue affects these releases of Ubuntu:
    
    | Series           | Base kernel  | Arch     | flavors          |
    |------------------+--------------+----------+------------------|
    | Ubuntu 18.04 LTS | 4.15.0       | amd64    | generic          |
    | Ubuntu 18.04 LTS | 4.15.0       | amd64    | lowlatency       |
    | Ubuntu 16.04 LTS | 4.4.0        | amd64    | generic          |
    | Ubuntu 16.04 LTS | 4.4.0        | amd64    | lowlatency       |
    
    Summary:
    
    Several security issues were fixed in the kernel.
    
    Software Description:
    - linux: Linux kernel
    
    Details:
    
    Vasiliy Kulikov discovered that the Bluetooth stack did not correctly check
    that device name strings were NULL terminated. A local attacker could
    exploit this to crash the system, leading to a denial of service, or leak
    contents of kernel stack memory, leading to a loss of privacy. 
    (CVE-2011-1079)
    
    It was discovered that the Linux kernel on ARM processors allowed a tracing
    process to modify a syscall after a seccomp decision had been made on that
    syscall. A local attacker could possibly use this to bypass seccomp
    restrictions. (CVE-2019-2054)
    
    It was discovered that a race condition leading to a use-after-free existed
    in the Reliable Datagram Sockets (RDS) protocol implementation in the Linux
    kernel. The RDS protocol is blacklisted by default in Ubuntu. If enabled, a
    local attacker could use this to cause a denial of service (system crash)
    or possibly execute arbitrary code. (CVE-2019-11815)
    
    It was discovered that the ext4 file system implementation in the Linux
    kernel did not properly zero out memory in some situations. A local
    attacker could use this to expose sensitive information (kernel memory). 
    (CVE-2019-11833)
    
    It was discovered that the Bluetooth Human Interface Device Protocol (HIDP)
    implementation in the Linux kernel did not properly verify strings were
    NULL terminated in certain situations. A local attacker could use this to
    expose sensitive information (kernel memory). (CVE-2019-11884)
    
    Update instructions:
    
    The problem can be corrected by updating your livepatches to the following
    versions:
    
    | Kernel                   | Version  | flavors                  |
    |--------------------------+----------+--------------------------|
    | 4.4.0-148.174            | 53.1     | lowlatency, generic      |
    | 4.4.0-150.176            | 53.1     | generic, lowlatency      |
    | 4.4.0-151.178            | 53.1     | lowlatency, generic      |
    | 4.4.0-154.181            | 53.1     | lowlatency, generic      |
    | 4.15.0-50.54             | 53.1     | generic, lowlatency      |
    | 4.15.0-50.54~16.04.1     | 53.1     | generic, lowlatency      |
    | 4.15.0-51.55             | 53.1     | generic, lowlatency      |
    | 4.15.0-51.55~16.04.1     | 53.1     | generic, lowlatency      |
    | 4.15.0-52.56             | 53.1     | lowlatency, generic      |
    | 4.15.0-52.56~16.04.1     | 53.1     | generic, lowlatency      |
    | 4.15.0-54.58             | 53.1     | generic, lowlatency      |
    | 4.15.0-54.58~16.04.1     | 53.1     | generic, lowlatency      |
    
    References:
      CVE-2011-1079, CVE-2019-2054, CVE-2019-11815, CVE-2019-11833, 
      CVE-2019-11884
    
    
    -- 
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