ESB-2018.2101 - [Win][UNIX/Linux] Apache HTTP Server: Denial of service - Remote/unauthenticated 2018-07-19

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.2101
 Multiple Denial of Service attacks were identified in Appache HTTP Server
                               19 July 2018

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Apache HTTP Server
Publisher:         The Apache Software Foundation
Operating System:  UNIX variants (UNIX, Linux, OSX)
                   Windows
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-8011 CVE-2018-1333 

Original Bulletin: 
   https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2018-8011
   https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2018-1333

Comment: This bulletin contains two (2) The Apache Software Foundation 
         security advisories.

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CVE-2018-8011: mod_md DoS via Coredumps on specially crafted requests

Severity: Moderate

Vendor: The Apache Software Foundation

Versions Affected:
httpd 2.4.33

Description:
By specially crafting HTTP requests, the mod_md challenge
handler would dereference a NULL pointer and cause the child
process to segfault. This could be used to DoS the server

Mitigation:
All httpd users should upgrade to 2.4.34 or later.

Credit:
The issue was discovered by Daniel Caminada

References:
https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2018-8011

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CVE-2018-1333: DoS for HTTP/2 connections by crafted requests

Severity: Low

Vendor: The Apache Software Foundation

Versions Affected:
httpd 2.4.18-2.4.33

Description:
By specially crafting HTTP/2 requests, workers would be
allocated 60 seconds longer than necessary, leading to
worker exhaustion and a denial of service.

Mitigation:
All httpd users should upgrade to 2.4.34 or later.

Credit:
The issue was discovered by Craig Young of Tripwire VERT.

References:
https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2018-1333

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