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Vulnerability Details : CVE-2011-4415

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, does not restrict the size of values of environment variables, which allows local users to cause a denial of service (memory consumption or NULL pointer dereference) via a .htaccess file with a crafted SetEnvIf directive, in conjunction with a crafted HTTP request header, related to (1) the "len +=" statement and (2) the apr_pcalloc function call, a different vulnerability than CVE-2011-3607.
Publish Date : 2011-11-08 Last Update Date : 2012-07-03
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- CVSS Scores & Vulnerability Types

CVSS Score
1.2
Confidentiality Impact None (There is no impact to the confidentiality of the system.)
Integrity Impact None (There is no impact to the integrity of the system)
Availability Impact Partial (There is reduced performance or interruptions in resource availability.)
Access Complexity High (Specialized access conditions exist. It is hard to exploit and several special conditions must be satisfied to exploit)
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) Denial Of Service
CWE ID 20

- Products Affected By CVE-2011-4415

# Product Type Vendor Product Version Update Edition Language
1 Application Apache Http Server 2.0 Version Details Vulnerabilities
2 Application Apache Http Server 2.0.9 Version Details Vulnerabilities
3 Application Apache Http Server 2.0.28 Version Details Vulnerabilities
4 Application Apache Http Server 2.0.28 Beta Version Details Vulnerabilities
5 Application Apache Http Server 2.0.32 Beta Version Details Vulnerabilities
6 Application Apache Http Server 2.0.32 Version Details Vulnerabilities
7 Application Apache Http Server 2.0.34 Beta Version Details Vulnerabilities
8 Application Apache Http Server 2.0.35 Version Details Vulnerabilities
9 Application Apache Http Server 2.0.36 Version Details Vulnerabilities
10 Application Apache Http Server 2.0.37 Version Details Vulnerabilities
11 Application Apache Http Server 2.0.38 Version Details Vulnerabilities
12 Application Apache Http Server 2.0.39 Version Details Vulnerabilities
13 Application Apache Http Server 2.0.40 Version Details Vulnerabilities
14 Application Apache Http Server 2.0.41 Version Details Vulnerabilities
15 Application Apache Http Server 2.0.42 Version Details Vulnerabilities
16 Application Apache Http Server 2.0.43 Version Details Vulnerabilities
17 Application Apache Http Server 2.0.44 Version Details Vulnerabilities
18 Application Apache Http Server 2.0.45 Version Details Vulnerabilities
19 Application Apache Http Server 2.0.46 Version Details Vulnerabilities
20 Application Apache Http Server 2.0.47 Version Details Vulnerabilities
21 Application Apache Http Server 2.0.48 Version Details Vulnerabilities
22 Application Apache Http Server 2.0.49 Version Details Vulnerabilities
23 Application Apache Http Server 2.0.50 Version Details Vulnerabilities
24 Application Apache Http Server 2.0.51 Version Details Vulnerabilities
25 Application Apache Http Server 2.0.52 Version Details Vulnerabilities
26 Application Apache Http Server 2.0.53 Version Details Vulnerabilities
27 Application Apache Http Server 2.0.54 Version Details Vulnerabilities
28 Application Apache Http Server 2.0.55 Version Details Vulnerabilities
29 Application Apache Http Server 2.0.56 Version Details Vulnerabilities
30 Application Apache Http Server 2.0.57 Version Details Vulnerabilities
31 Application Apache Http Server 2.0.58 Version Details Vulnerabilities
32 Application Apache Http Server 2.0.59 Version Details Vulnerabilities
33 Application Apache Http Server 2.0.60 Version Details Vulnerabilities
34 Application Apache Http Server 2.0.61 Version Details Vulnerabilities
35 Application Apache Http Server 2.0.63 Version Details Vulnerabilities
36 Application Apache Http Server 2.0.64 Version Details Vulnerabilities
37 Application Apache Http Server 2.2.0 Version Details Vulnerabilities
38 Application Apache Http Server 2.2.1 Version Details Vulnerabilities
39 Application Apache Http Server 2.2.2 Version Details Vulnerabilities
40 Application Apache Http Server 2.2.3 Version Details Vulnerabilities
41 Application Apache Http Server 2.2.4 Version Details Vulnerabilities
42 Application Apache Http Server 2.2.6 Version Details Vulnerabilities
43 Application Apache Http Server 2.2.8 Version Details Vulnerabilities
44 Application Apache Http Server 2.2.9 Version Details Vulnerabilities
45 Application Apache Http Server 2.2.10 Version Details Vulnerabilities
46 Application Apache Http Server 2.2.11 Version Details Vulnerabilities
47 Application Apache Http Server 2.2.12 Version Details Vulnerabilities
48 Application Apache Http Server 2.2.13 Version Details Vulnerabilities
49 Application Apache Http Server 2.2.14 Version Details Vulnerabilities
50 Application Apache Http Server 2.2.15 Version Details Vulnerabilities
51 Application Apache Http Server 2.2.16 Version Details Vulnerabilities
52 Application Apache Http Server 2.2.18 Version Details Vulnerabilities
53 Application Apache Http Server 2.2.19 Version Details Vulnerabilities
54 Application Apache Http Server 2.2.20 Version Details Vulnerabilities
55 Application Apache Http Server 2.2.21 Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Apache Http Server 55

- References For CVE-2011-4415

http://www.halfdog.net/Security/2011/ApacheModSetEnvIfIntegerOverflow/
http://www.halfdog.net/Security/2011/ApacheModSetEnvIfIntegerOverflow/DemoExploit.html
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c03360041
HP SSRT100877
http://www.gossamer-threads.com/lists/apache/dev/403775 CONFIRM

- Metasploit Modules Related To CVE-2011-4415

There are not any metasploit modules related to this vulnerability (Please visit www.metasploit.com for more information)


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