Patching the Buffer Overflow in Squid servers on Linux platforms



    A buffer overflow vulnerability was reported in Squid servers. This vulnerability could be exploited to trigger a denial-of-service and execute arbitrary code on the vulnerable servers.

    CVE's assigned:

    * CVE-2019-12527

    Affected Platforms:

    * Linux


    To address this vulnerability, the vendor has released patches for the Squid package. For more information, please refer to our blog:

    Use SanerNow platform to apply this critical patch quickly across the organization as shown below.


    Vulnerability detection and patching of the squid package:

    1. Login to SanerNow platform
    2. Switch to the account/site specific view and Go to ‘VM tool’
    3. If the vulnerable version of Squid is installed on your system, Saner lists CVE-2019-12527 in ‘Top Vulnerabilities or ‘Recently Discovered Vulnerabilities as shown in the below diagram:


    1. Search for this vulnerability in VM tool. If you are affected, apply the patch through PM -> Missing Patches
    2. Select ‘Groups/Devices in the ‘Asset Source section and click ‘Apply’.
    3. Select the product ‘squid’ from the ‘Asset section as shown in the below diagram:


    1. Select ‘Apply Selected Patches’ at the rightmost corner. This will prompt for ‘Creating Patching Task’. Fill in ‘Task Name’ and ‘Remediation Schedule’ as per your preference and click on ‘Apply Selected Patches’ as shown below:


    8. Remediation job will be created, which will fix the vulnerabilities by upgrading squid to the latest version.

    9. Once remediation is done, the Saner agent automatically scans again and uploads the result to SanerNow as shown below:


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