Vulnerabilities
Misconfiguration
Compliance
CVE Vulnerabilities

CVE-2009-1891

Uncontrolled Resource Consumption

Published: Jul 10, 2009 | Modified: Apr 09, 2025
CVSS 3.x
N/A
Source:
NVD
CVSS 2.x
7.1 HIGH
AV:N/AC:M/Au:N/C:N/I:N/A:C
RedHat/V2
2.6 LOW
AV:N/AC:H/Au:N/C:N/I:N/A:P
RedHat/V3
Ubuntu
MEDIUM
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2009-1891
CWEhttps://cwe.mitre.org/data/definitions/400.html

The mod_deflate module in Apache httpd 2.2.11 and earlier compresses large files until completion even after the associated network connection is closed, which allows remote attackers to cause a denial of service (CPU consumption).

Weakness

The product does not properly control the allocation and maintenance of a limited resource.

Affected Software

NameVendorStart VersionEnd Version
Http_serverApache2.0.35 (including)2.0.64 (excluding)
Http_serverApache2.2.0 (including)2.2.12 (excluding)
JBEWS 1.0 for RHEL 4RedHathttpd22-0:2.2.10-23.1.ep5.el4*
Red Hat Certificate System 7.3RedHatant-0:1.6.5-1jpp_1rh*
Red Hat Certificate System 7.3RedHatavalon-logkit-0:1.2-2jpp_4rh*
Red Hat Certificate System 7.3RedHataxis-0:1.2.1-1jpp_3rh*
Red Hat Certificate System 7.3RedHatclasspathx-jaf-0:1.0-2jpp_6rh*
Red Hat Certificate System 7.3RedHatclasspathx-mail-0:1.1.1-2jpp_8rh*
Red Hat Certificate System 7.3RedHatgeronimo-specs-0:1.0-0.M4.1jpp_10rh*
Red Hat Certificate System 7.3RedHatjakarta-commons-modeler-0:2.0-3jpp_2rh*
Red Hat Certificate System 7.3RedHatlog4j-0:1.2.12-1jpp_1rh*
Red Hat Certificate System 7.3RedHatmx4j-1:3.0.1-1jpp_4rh*
Red Hat Certificate System 7.3RedHatpcsc-lite-0:1.3.3-3.el4*
Red Hat Certificate System 7.3RedHatrhpki-ca-0:7.3.0-20.el4*
Red Hat Certificate System 7.3RedHatrhpki-java-tools-0:7.3.0-10.el4*
Red Hat Certificate System 7.3RedHatrhpki-kra-0:7.3.0-14.el4*
Red Hat Certificate System 7.3RedHatrhpki-manage-0:7.3.0-19.el4*
Red Hat Certificate System 7.3RedHatrhpki-native-tools-0:7.3.0-6.el4*
Red Hat Certificate System 7.3RedHatrhpki-ocsp-0:7.3.0-13.el4*
Red Hat Certificate System 7.3RedHatrhpki-tks-0:7.3.0-13.el4*
Red Hat Certificate System 7.3RedHattomcat5-0:5.5.23-0jpp_4rh.16*
Red Hat Certificate System 7.3RedHatxerces-j2-0:2.7.1-1jpp_1rh*
Red Hat Certificate System 7.3RedHatxml-commons-0:1.3.02-2jpp_1rh*
Red Hat Enterprise Linux 3RedHathttpd-0:2.0.46-75.ent*
Red Hat Enterprise Linux 4RedHathttpd-0:2.0.52-41.ent.6*
Red Hat Enterprise Linux 5RedHathttpd-0:2.2.3-22.el5_3.2*
Red Hat JBoss Enterprise Web Server 1 for RHEL 5RedHathttpd-0:2.2.10-10.ep5.el5*
Apache2Ubuntudapper*
Apache2Ubuntuhardy*
Apache2Ubuntuintrepid*
Apache2Ubuntujaunty*
Apache2Ubuntuupstream*

Potential Mitigations

  • Mitigation of resource exhaustion attacks requires that the target system either:

  • The first of these solutions is an issue in itself though, since it may allow attackers to prevent the use of the system by a particular valid user. If the attacker impersonates the valid user, they may be able to prevent the user from accessing the server in question.

  • The second solution is simply difficult to effectively institute – and even when properly done, it does not provide a full solution. It simply makes the attack require more resources on the part of the attacker.

References

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