Denial of service in Apache HTTP Server

1) Resource exhaustion

EUVDB-ID: #VU2934

Risk: High

CVSSv3.1: 8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:F/RL:O/RC:C]

CVE-ID: CVE-2011-3192

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to cause DoS conditions on the target system.

The weakness exists due to an error in the ByteRange filter when processing malicious requests in Apache HTTP server. A remote attacker can send a specially crafted HTTP request containing an overly large Range header, exhaust all available memory resources and trigger the application to crash.

Successful exploitation of the vulnerability results in denial service on the vulnerable system.

Note: the vulnerability was being actively exploited.

Mitigation

Upgrade to the latest version of Apache HTTP Server 2.2.20 or 2.0.65.

Vulnerable software versions

Apache HTTP Server: 2.0.11 - 2.2.19

External links

http://httpd.apache.org/security/CVE-2011-3192.txt

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. However, a fully functional exploit for this vulnerability is available.