Vulnerability Description
The Apache HTTP Server 2.4.18 through 2.4.20, when mod_http2 and mod_ssl are enabled, does not properly recognize the "SSLVerifyClient require" directive for HTTP/2 request authorization, which allows remote attackers to bypass intended access restrictions by leveraging the ability to send multiple requests over a single connection and aborting a renegotiation.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Apache | Http Server | 2.4.18 |
Related Weaknesses (CWE)
References
- http://httpd.apache.org/security/vulnerabilities_24.htmlPatchVendor Advisory
- http://packetstormsecurity.com/files/137771/Apache-2.4.20-X509-Authentication-By
- http://seclists.org/fulldisclosure/2016/Jul/11
- http://www.apache.org/dist/httpd/CHANGES_2.4
- http://www.openwall.com/lists/oss-security/2016/07/05/5
- http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html
- http://www.oracle.com/technetwork/topics/security/bulletinoct2016-3090566.html
- http://www.securityfocus.com/bid/91566
- http://www.securitytracker.com/id/1036225
- https://access.redhat.com/errata/RHSA-2016:1420
- https://github.com/apache/httpd/commit/2d0e4eff04ea963128a41faaef21f987272e05a2
- https://lists.apache.org/thread.html/56c2e7cc9deb1c12a843d0dc251ea7fd3e7e80293cd
- https://lists.apache.org/thread.html/84a3714f0878781f6ed84473d1a503d2cc382277e10
- https://lists.apache.org/thread.html/r04e89e873d54116a0635ef2f7061c15acc5ed27ef7
- https://lists.apache.org/thread.html/r76142b8c5119df2178be7c2dba88fde552eedeec37
FAQ
What is CVE-2016-4979?
CVE-2016-4979 is a vulnerability with a CVSS score of 7.5 (HIGH). The Apache HTTP Server 2.4.18 through 2.4.20, when mod_http2 and mod_ssl are enabled, does not properly recognize the "SSLVerifyClient require" directive for HTTP/2 request authorization, which allows...
How severe is CVE-2016-4979?
CVE-2016-4979 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2016-4979?
Check the references section above for vendor advisories and patch information. Affected products include: Apache Http Server.