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  • NetScaler WAF Signatures Update v130


    NetScaler Cyber Threat Intelligence
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    NetScaler WAF Signatures Update v130

     

    NetScaler has released a new version of its integrated Web App Firewall signatures to help customers mitigate several CVEs with variable CVSS. 

    CVE-2024-4434: The LearnPress – WordPress LMS Plugin harbors a weakness, a time-based SQL Injection vulnerability. In versions up to, and including, 4.2.6.5, the plugin fails to adequately escape the term_id parameter. This oversight allows unauthenticated attackers to inject additional SQL queries, potentially extracting sensitive information from the database .

    CVE-2024-4397: Within the same plugin, LearnPress, lies another flaw—this time, an arbitrary file upload vulnerability. The issue arises due to the absence of proper file type validation in the save_post_materials function (versions up to 4.2.6.5). Attackers with Instructor-level permissions or higher can upload arbitrary files, opening the door to potential remote code execution .

    CVE-2024-30163: Alas, this one remains shrouded in mystery. Details for CVE-2024-30163 are currently reserved, leaving us in suspense. When the veil lifts, we’ll learn more about the nature of this vulnerability.

     Signatures included in v130:

    Signature rule

    CVE ID

    Description

    998489

    CVE-2024-4434

    WEB-WORDPRESS LearnPress Prior To 4.2.6.6 - Unauthenticated SQL Injection Vulnerability (CVE-2024-4434)

    998490

    CVE-2024-4397

    WEB-WORDPRESS LearnPress Prior To 4.2.6.6 - Arbitrary File Upload Vulnerability (CVE-2024-4397)

    998491

    CVE-2024-30163

    WEB-MISC Invision Community Prior to 4.7.16 - SQL Injection Vulnerability (CVE-2024-30163)

    NetScaler customers can quickly import the above signatures to help reduce risk and lower exposure associated with these vulnerabilities. Signatures are compatible with NetScaler (formerly Citrix ADC) software version 11.1, 12.0, 12.1, 13.0 and 13.1. NOTE: Software versions 11.1 and 12.0 are end of life, and you should consider upgrading for continued support. Learn more about the NetScaler software release lifecycle.

     

    If you are already using NetScaler Web App Firewall with the signature auto-update feature enabled, verify that your signature file version is 130 or later and then follow these steps.

    1. Search your signatures for <number>
    2. Select the results with ID 
    3. Choose “Enable Rules” and click OK

     

    NetScaler WAF Best Practices

    NetScaler recommends that WAF users always download the latest signature version, enable signature auto-update, and subscribe to receive signature alert notifications. NetScaler will continue to monitor this dynamic situation and provide updates as new mitigations become available.

     

    Handling false positives

    If app availability is affected by false positives that result from the above mitigation policies, relaxations can be applied. NetScaler recommends the following modifications to the policy.

     

    Modifications to NetScaler Web App Firewall Policy:

    add policy patset exception_list

    # (Example: bind policy patset exception_list “/exception_url”) 

    Prepend the existing WAF policy with:

    HTTP.REQ.URL.CONTAINS_ANY(“exception_list”).NOT

    # (Example :  set appfw policy my_WAF_policy q^HTTP.REQ.URL.CONTAINS_ANY(“exception_list”).NOT && <existing rule>^

    NOTE: Any endpoint covered by the exception_list may expose those assets to risks 

    Additional Information

    NetScaler Web App Firewall benefits from a single code base across all its form-factors (physical, virtual, bare-metal, and containers). This signature update applies to all form factors and deployment models of NetScaler Web App Firewall.

    Learn more about NetScaler Web app Firewall, read our alert articles and bot signature articles to learn more about NetScaler WAF signatures, and find out how you can receive signature alert notifications.

    Please join the NetScaler Community today and engage with your peers to learn more about how they are protecting their businesses with NetScaler WAF. 





     


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