Vulnerability Name:

CVE-2011-4415 (CCN-71181)

Assigned:2011-11-02
Published:2011-11-02
Updated:2012-07-03
Summary: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.
CVSS v3 Severity:5.1 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
CVSS v2 Severity:1.2 Low (CVSS v2 Vector: AV:L/AC:H/Au:N/C:N/I:N/A:P)
0.9 Low (Temporal CVSS v2 Vector: AV:L/AC:H/Au:N/C:N/I:N/A:P/E:U/RL:U/RC:UR)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): High
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
4.0 Medium (CCN CVSS v2 Vector: AV:L/AC:H/Au:N/C:N/I:N/A:C)
3.2 Low (CCN Temporal CVSS v2 Vector: AV:L/AC:H/Au:N/C:N/I:N/A:C/E:U/RL:U/RC:UR)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): High
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
Vulnerability Type:CWE-20
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2011-4415

Source: HP
Type: UNKNOWN
SSRT100877

Source: CCN
Type: Apache HTTP Server Project Web site
Apache HTTPD Project - The Apache HTTPD Server Project

Source: CCN
Type: SA46823
Apache HTTP Server "ap_pregsub()" Denial of Service Vulnerability

Source: CONFIRM
Type: UNKNOWN
http://www.gossamer-threads.com/lists/apache/dev/403775

Source: CCN
Type: halfdog Web site
Integer Overflow in Apache ap_pregsub via mod-setenvif

Source: MISC
Type: Exploit, Patch
http://www.halfdog.net/Security/2011/ApacheModSetEnvIfIntegerOverflow/

Source: MISC
Type: Exploit
http://www.halfdog.net/Security/2011/ApacheModSetEnvIfIntegerOverflow/DemoExploit.html

Source: CCN
Type: BID-50639
Apache HTTP Server 'ap_pregsub()' Function Local Denial of Service Vulnerability

Source: XF
Type: UNKNOWN
apache-appregsub-dos(71181)

Vulnerable Configuration:Configuration 1:
  • cpe:/a:apache:http_server:2.0:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.9:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.28:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.28:beta:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.32:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.32:beta:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.34:beta:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.35:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.36:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.37:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.38:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.39:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.40:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.41:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.42:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.43:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.44:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.45:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.46:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.47:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.48:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.49:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.50:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.51:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.52:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.53:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.54:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.55:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.56:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.57:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.58:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.59:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.60:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.61:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.63:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.64:*:*:*:*:*:*:*

    • Configuration 2:
  • cpe:/a:apache:http_server:2.2.0:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.2.1:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.2.2:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.2.3:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.2.4:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.2.6:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.2.8:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.2.9:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.2.10:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.2.11:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.2.12:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.2.13:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.2.14:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.2.15:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.2.16:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.2.18:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.2.19:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.2.20:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.2.21:*:*:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/a:apache:http_server:2.0.28:beta:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.38:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.39:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.42:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.47:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.49:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.48:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.51:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.52:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.40:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.59:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.2.4:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.46:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.55:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.2.3:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.2.0:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.2.2:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.2.6:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.28:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.32:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.35:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.36:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.37:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.41:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.32:beta:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.34:beta:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.43:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.44:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.45:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.50:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.53:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.54:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.56:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.57:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.58:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.60:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.61:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.9:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.2.1:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.63:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.2.8:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.2.9:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.2.11:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.2.10:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.2.13:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.2.12:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.2.14:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.2.15:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.2.16:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.2.18:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.2.19:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.2.20:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.2.21:*:*:*:*:*:*:*
  • OR cpe:/a:apache:http_server:2.0.64:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    apache http server 2.0
    apache http server 2.0.9
    apache http server 2.0.28
    apache http server 2.0.28 beta
    apache http server 2.0.32
    apache http server 2.0.32 beta
    apache http server 2.0.34 beta
    apache http server 2.0.35
    apache http server 2.0.36
    apache http server 2.0.37
    apache http server 2.0.38
    apache http server 2.0.39
    apache http server 2.0.40
    apache http server 2.0.41
    apache http server 2.0.42
    apache http server 2.0.43
    apache http server 2.0.44
    apache http server 2.0.45
    apache http server 2.0.46
    apache http server 2.0.47
    apache http server 2.0.48
    apache http server 2.0.49
    apache http server 2.0.50
    apache http server 2.0.51
    apache http server 2.0.52
    apache http server 2.0.53
    apache http server 2.0.54
    apache http server 2.0.55
    apache http server 2.0.56
    apache http server 2.0.57
    apache http server 2.0.58
    apache http server 2.0.59
    apache http server 2.0.60
    apache http server 2.0.61
    apache http server 2.0.63
    apache http server 2.0.64
    apache http server 2.2.0
    apache http server 2.2.1
    apache http server 2.2.2
    apache http server 2.2.3
    apache http server 2.2.4
    apache http server 2.2.6
    apache http server 2.2.8
    apache http server 2.2.9
    apache http server 2.2.10
    apache http server 2.2.11
    apache http server 2.2.12
    apache http server 2.2.13
    apache http server 2.2.14
    apache http server 2.2.15
    apache http server 2.2.16
    apache http server 2.2.18
    apache http server 2.2.19
    apache http server 2.2.20
    apache http server 2.2.21
    apache http server 2.0.28 beta
    apache http server 2.0
    apache http server 2.0.38
    apache http server 2.0.39
    apache http server 2.0.42
    apache http server 2.0.47
    apache http server 2.0.49
    apache http server 2.0.48
    apache http server 2.0.51
    apache http server 2.0.52
    apache http server 2.0.40
    apache http server 2.0.59
    apache http server 2.2.4
    apache http server 2.0.46
    apache http server 2.0.55
    apache http server 2.2.3
    apache http server 2.2.0
    apache http server 2.2.2
    apache http server 2.2.6
    apache http server 2.0.28
    apache http server 2.0.32
    apache http server 2.0.35
    apache http server 2.0.36
    apache http server 2.0.37
    apache http server 2.0.41
    apache http server 2.0.32 beta
    apache http server 2.0.34 beta
    apache http server 2.0.43
    apache http server 2.0.44
    apache http server 2.0.45
    apache http server 2.0.50
    apache http server 2.0.53
    apache http server 2.0.54
    apache http server 2.0.56
    apache http server 2.0.57
    apache http server 2.0.58
    apache http server 2.0.60
    apache http server 2.0.61
    apache http server 2.0.9
    apache http server 2.2.1
    apache http server 2.0.63
    apache http server 2.2.8
    apache http server 2.2.9
    apache http server 2.2.11
    apache http server 2.2.10
    apache http server 2.2.13
    apache http server 2.2.12
    apache http server 2.2.14
    apache http server 2.2.15
    apache http server 2.2.16
    apache http server 2.2.18
    apache http server 2.2.19
    apache http server 2.2.20
    apache http server 2.2.21
    apache http server 2.0.64