Permissions, Privileges, and Access Controls in Apache HTTP Server

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU32392

Risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2015-3185

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to manipulate data.

The ap_some_auth_required function in server/request.c in the Apache HTTP Server 2.4.x before 2.4.14 does not consider that a Require directive may be associated with an authorization setting rather than an authentication setting, which allows remote attackers to bypass intended access restrictions in opportunistic circumstances by leveraging the presence of a module that relies on the 2.2 API behavior.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Apache HTTP Server: 2.4.0 - 2.4.13

External links

http://httpd.apache.org/security/vulnerabilities_24.html
http://lists.apple.com/archives/security-announce/2015/Aug/msg00001.html
http://lists.apple.com/archives/security-announce/2015/Sep/msg00002.html
http://lists.apple.com/archives/security-announce/2015/Sep/msg00004.html
http://lists.opensuse.org/opensuse-updates/2015-10/msg00011.html
http://rhn.redhat.com/errata/RHSA-2015-1666.html
http://rhn.redhat.com/errata/RHSA-2015-1667.html
http://rhn.redhat.com/errata/RHSA-2016-2957.html
http://www.apache.org/dist/httpd/CHANGES_2.4
http://www.debian.org/security/2015/dsa-3325
http://www.securityfocus.com/bid/75965
http://www.securitytracker.com/id/1032967
http://www.ubuntu.com/usn/USN-2686-1
http://access.redhat.com/errata/RHSA-2017:2708
http://access.redhat.com/errata/RHSA-2017:2709
http://access.redhat.com/errata/RHSA-2017:2710
http://github.com/apache/httpd/commit/cd2b7a26c776b0754fb98426a67804fd48118708
http://lists.apache.org/thread.html/56c2e7cc9deb1c12a843d0dc251ea7fd3e7e80293cde02fcd65286ba@%3Ccvs.httpd.apache.org%3E
http://lists.apache.org/thread.html/84a3714f0878781f6ed84473d1a503d2cc382277e100450209231830@%3Ccvs.httpd.apache.org%3E
http://lists.apache.org/thread.html/rd18c3c43602e66f9cdcf09f1de233804975b9572b0456cc582390b6f@%3Ccvs.httpd.apache.org%3E
http://lists.apache.org/thread.html/re3d27b6250aa8548b8845d314bb8a350b3df326cacbbfdfe4d455234@%3Ccvs.httpd.apache.org%3E
http://support.apple.com/HT205217
http://support.apple.com/HT205219
http://support.apple.com/kb/HT205031

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.