CVE-2011-4415
What it is
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.
At a glance
- Exploitability
- Can be exploited locally on the machine without logging in. Limited direct impact.
- Exploit odds
- 3.0% chance of exploitation in the next 30 days (EPSS).
- Fix
- A patch, advisory or fixed version is referenced. Upgrade or apply it.
Timeline
- PublishedDisclosed publicly on CVE.org and NVD
- Last updatedMost recent change to the record
Why it ranks here
- Exploited in the wild: no, CISA does not list it.
- Exploit odds: 3.0% in the next 30 days (EPSS).
- Severity: 1.2 LOW (CVSS).
- Fix: a patch or advisory is linked.
Details
- Published
- Last modified
- Exploit probability
- 3.0% · EPSS, next 30 days
- Weakness
- CWE-20 · Improper input validation
- Record status
- Modified
Affected
- Apache Http Server 2.0
- Apache Http Server 2.0.9
- Apache Http Server 2.0.28
- Apache Http Server 2.0.32
- Apache Http Server 2.0.34
- Apache Http Server 2.0.35
- Apache Http Server 2.0.36
- Apache Http Server 2.0.37
Attack profile CVSS 2.0 · 1.2
- Attack vector
- Local
- Complexity
- High
- Authentication
- None
- Confidentiality
- None
- Integrity
- None
- Availability
- Partial
Raw vector
AV:L/AC:H/Au:N/C:N/I:N/A:P
Is it in your code?
Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.
Read https://cve-list.com/agent/cve/CVE-2011-4415.md and follow it. Check whether this project is affected by CVE-2011-4415. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.
Fix and advisories
- http://www.halfdog.net/Security/2011/ApacheModSetEnvIfIntegerOverflow/
- http://www.halfdog.net/Security/2011/ApacheModSetEnvIfIntegerOverflow/
References
- http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c03360041
- http://www.gossamer-threads.com/lists/apache/dev/403775
- 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
- http://www.gossamer-threads.com/lists/apache/dev/403775
- http://www.halfdog.net/Security/2011/ApacheModSetEnvIfIntegerOverflow/
- http://www.halfdog.net/Security/2011/ApacheModSetEnvIfIntegerOverflow/DemoExploit.html