Ubuntu 4058-2: Bash vulnerability

    Date05 Aug 2019
    CategoryUbuntu
    2596
    Posted ByLinuxSecurity Advisories
    A system hardening measure could be bypassed.
    ==========================================================================
    Ubuntu Security Notice USN-4058-2
    August 05, 2019
    
    bash vulnerability
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 14.04 ESM
    - Ubuntu 12.04 ESM
    
    Summary:
    
    A system hardening measure could be bypassed.
    
    Software Description:
    - bash: GNU Bourne Again SHell
    
    Details:
    
    USN-4058-1 fixed a vulnerability in bash. This update provides
    the corresponding update for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM.
    
    Original advisory details:
    
     It was discovered that Bash incorrectly handled the restricted shell. An
     attacker could possibly use this issue to escape restrictions and execute
     any command.
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 14.04 ESM:
      bash                            4.3-7ubuntu1.8+esm1
    
    Ubuntu 12.04 ESM:
      bash                            4.2-2ubuntu2.8
    
    In general, a standard system update will make all the necessary changes.
    
    References:
      https://usn.ubuntu.com/4058-2
      https://usn.ubuntu.com/4058-1
      CVE-2019-9924
    
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