Apache Tomcat 'Transfer-Encoding' Header Processing Flaw Lets Remote Users Deny Service and Obtain Potentially Sensitive Information
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SecurityTracker Alert ID: 1024180 |
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SecurityTracker URL: http://securitytracker.com/id/1024180
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CVE Reference:
CVE-2010-2227
(Links to External Site)
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Date: Jul 12 2010
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Impact:
Denial of service via network, Disclosure of user information
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Fix Available: Yes Vendor Confirmed: Yes
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Version(s): 5.5.0 to 5.5.29, 6.0.0 to 6.0.27, 7.0.0
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Description:
A vulnerability was reported in Tomcat. A remote user can cause denial of service conditions. A remote user can obtain potentially sensitive information.
A remote user can send a request with a specially crafted 'Transfer-Encoding' header value to trigger a buffer recycling error and cause subsequent requests to fail or cause information from other requests to be leaked to the user.
Steve Jones reported this vulnerability.
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Impact:
A remote user can cause denial of service conditions.
A remote user can obtain information from other requests.
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Solution:
The vendor has issued a fix.
Tomcat 5.5.x users should upgrade to 5.5.30 or apply this patch:
http://svn.apache.org/viewvc?view=revision&revision=959428
Tomcat 6.0.x users should upgrade to 6.0.28 or apply this patch:
http://svn.apache.org/viewvc?view=revision&revision=958977
Tomcat 7.0.x users should upgrade to 7.0.1 when released or apply this patch:
http://svn.apache.org/viewvc?view=revision&revision=958911
The vendor's advisory is available at:
http://tomcat.apache.org/security-7.html
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Vendor URL: tomcat.apache.org/security-7.html (Links to External Site)
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Cause:
Access control error, State error
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Underlying OS:
Linux (Any), UNIX (Any), Windows (Any)
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Message History:
This archive entry has one or more follow-up message(s) listed below.
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Source Message Contents
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Date: Fri, 09 Jul 2010 17:31:00 +0100
Subject: [SECURITY] CVE-2010-2227: Apache Tomcat Remote Denial Of Service and Information Disclosure Vulnerability
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
CVE-2010-2227: Apache Tomcat Remote Denial Of Service and Information
Disclosure Vulnerability
Severity: Important
Vendor:
The Apache Software Foundation
Versions Affected:
Tomcat 5.5.0 to 5.5.29
Tomcat 6.0.0 to 6.0.27
Tomcat 7.0.0
Note: 7.0.0 is still beta.
Note: The unsupported Tomcat 3.x, 4.x and 5.0.x versions may also be
affected.
Description:
Several flaws in the handling of the 'Transfer-Encoding' header were
found that prevented the recycling of a buffer. A remote attacker could
trigger this flaw which would cause subsequent requests to fail and/or
information to leak between requests.
Mitigation:
- - Tomcat 5.5.x users should upgrade to 5.5.30 or apply this patch:
http://svn.apache.org/viewvc?view=revision&revision=959428
- - Tomcat 6.0.x users should upgrade to 6.0.28 or apply this patch:
http://svn.apache.org/viewvc?view=revision&revision=958977
- - Tomcat 7.0.x users should upgrade to 7.0.1 when released or apply this
patch:
http://svn.apache.org/viewvc?view=revision&revision=958911
- - All users may mitigate this flaw by running Tomcat behind a reverse
proxy (such as Apache httpd 2.2) that rejects invalid values for
Transfer-Encoding.
Credit:
This issue was discovered by Steve Jones
References:
http://tomcat.apache.org/security.html
http://tomcat.apache.org/security-7.html
http://tomcat.apache.org/security-6.html
http://tomcat.apache.org/security-5.html
The Apache Tomcat Security Team
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