Apache2 mod_http2 header Denial of Service Vulnerability

December 10th, 2018
ZDI-18-1369 ZDI-CAN-7168

CVE ID

CVE-2018-11763

CVSS Score

5.3 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected Vendors

Apache

Affected Products

HTTPD Server 2.x

Vulnerability Details

This vulnerability allows remote attackers to create a denial of service condition on vulnerable installations of Apache HTTPD server. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the handling of HTTP2 headers. A crafted HTTP2 request can trigger a read past the end of an allocated buffer. An attacker can leverage this vulnerability to create a denial-of-service condition on the system.

Additional Details

Apache has issued an update to correct this vulnerability. More details can be found at:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-11763

Disclosure Timeline

  • 2018-08-22 - Vulnerability reported to vendor
  • 2018-12-10 - Coordinated public release of advisory

Credit

David Fiser

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