CVE-2016-4979
Published: 6 July 2016
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.
Notes
| Author | Note |
|---|---|
| mdeslaur | advisory says introduced in 2.4.18 xenial package not built with mod_http2 support |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
apache2 Launchpad, Ubuntu, Debian |
precise |
Not vulnerable
(code not present)
|
| trusty |
Not vulnerable
(code not present)
|
|
| upstream |
Released
(2.4.23-1)
|
|
| wily |
Not vulnerable
(code not present)
|
|
| xenial |
Not vulnerable
(no mod_http2 support)
|
|
|
Patches: upstream: https://svn.apache.org/r1750779 |
||
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.5 |
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity impact | High |
| Availability impact | None |
| Vector | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |