Heap-based buffer overflow in Apache HTTP Server

1) Heap-based buffer overflow

EUVDB-ID: #VU32830

Risk: Medium

CVSSv4.0: 2 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2011-3607

CWE-ID: CWE-122 - Heap-based Buffer Overflow

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in Integer overflow in the ap_pregsub function in server/util.c in the Apache HTTP Server 2.0.x through 2.0.64 and 2.2.x through 2.2.21, when the mod_setenvif module is enabled,. A remote attacker can use a .htaccess file with a crafted SetEnvIf directive to trigger heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Update to version 2.0.65.

Vulnerable software versions

Apache HTTP Server: 2.0.11 - 2.0.64

CPE2.3

• cpe:2.3:a:apache_foundation:apache_http_server:2.0.11:*:*:*:*:*:*:*
• cpe:2.3:a:apache_foundation:apache_http_server:2.0.12:*:*:*:*:*:*:*
• cpe:2.3:a:apache_foundation:apache_http_server:2.0.13:*:*:*:*:*:*:*

External links

https://archives.neohapsis.com/archives/fulldisclosure/2011-11/0023.html
https://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c03360041
https://lists.apple.com/archives/security-announce/2012/Sep/msg00004.html
https://marc.info/?l=bugtraq&m=133294460209056&w=2
https://marc.info/?l=bugtraq&m=133494237717847&w=2
https://marc.info/?l=bugtraq&m=134987041210674&w=2
https://rhn.redhat.com/errata/RHSA-2012-0128.html
https://rhn.redhat.com/errata/RHSA-2012-0542.html
https://rhn.redhat.com/errata/RHSA-2012-0543.html
https://secunia.com/advisories/45793
https://secunia.com/advisories/48551
https://securitytracker.com/id?1026267
https://support.apple.com/kb/HT5501
https://www.debian.org/security/2012/dsa-2405
https://www.fujitsu.com/global/support/software/security/products-f/interstage-201303e.html
https://www.halfdog.net/Security/2011/ApacheModSetEnvIfIntegerOverflow/
https://www.halfdog.net/Security/2011/ApacheModSetEnvIfIntegerOverflow/DemoExploit.html
https://www.mandriva.com/security/advisories?name=MDVSA-2012:003
https://www.mandriva.com/security/advisories?name=MDVSA-2013:150
https://www.oracle.com/technetwork/topics/security/cpujan2015-1972971.html
https://www.oracle.com/technetwork/topics/security/cpujul2012-392727.html
https://www.osvdb.org/76744
https://www.securityfocus.com/bid/50494
https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/811422
https://bugzilla.redhat.com/show_bug.cgi?id=750935
https://exchange.xforce.ibmcloud.com/vulnerabilities/71093
https://lists.apache.org/thread.html/54a42d4b01968df1117cea77fc53d6beb931c0e05936ad02af93e9ac@%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/5df9bfb86a3b054bb985a45ff9250b0332c9ecc181eec232489e7f79@%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/8d63cb8e9100f28a99429b4328e4e7cebce861d5772ac9863ba2ae6f@%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/f7f95ac1cd9895db2714fa3ebaa0b94d0c6df360f742a40951384a53@%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/r0276683d8e1e07153fc8642618830ac0ade85b9ae0dc7b07f63bb8fc@%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/r57608dc51b79102f3952ae06f54d5277b649c86d6533dcd6a7d201f7@%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/r8828e649175df56f1f9e3919938ac7826128525426e2748f0ab62feb@%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/rfbaf647d52c1cb843e726a0933f156366a806cead84fbd430951591b@%3Ccvs.httpd.apache.org%3E

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

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.

The attacker would have to login to the system and perform certain actions in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.