Improper input validation in Apache HTTP Server
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.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
EPSS: 0.031 (86.4th percentile) — read the EPSS interpretation.
Affected products
- Apache Http_server — versions 2.0, 2.0.9, 2.0.28
- N/a — versions n/a
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cve@mitre.org (x_refsource_HP, vendor-advisory)
- cve@mitre.org (Exploit, x_refsource_MISC)
- cve@mitre.org (x_refsource_CONFIRM)
- cve@mitre.org (Exploit, Patch, x_refsource_MISC)
Frequently asked questions
- What is CVE-2011-4415?
- CVE-2011-4415 is a vulnerability in Apache HTTP Server, classified under Improper Input Validation. Published 2011-11-08.
- Is CVE-2011-4415 known to be exploited?
- 24 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.