Security Bulletin
Summary
Apache Tomcat 10.0.0-M1 to 10.0.6, 9.0.0.M1 to 9.0.46 and 8.5.0 to 8.5.66 did not correctly parse the HTTP transfer-encoding request header in some circumstances leading to the possibility to request smuggling when used with a reverse proxy. Specifically: - Tomcat incorrectly ignored the transfer encoding header if the client declared it would only accept an HTTP/1.0 response; - Tomcat honoured the identify encoding; and - Tomcat did not ensure that, if present, the chunked encoding was the final encoding.
Vulnerability Details
CVEID: CVE-2021-33037
DESCRIPTION: Apache Tomcat is vulnerable to HTTP request smuggling, caused by improper parsing of the HTTP transfer-encoding request header. By sending a specially-crafted HTTP(S) transfer-encoding request header, an attacker could exploit this vulnerability to poison the web cache, bypass web application firewall protection, and conduct XSS attacks.
CVSS Base score: 5.3
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/205222 for the current score.
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N)
Affected Products and Versions
| Affected Product(s) | Version(s) |
| UCD - IBM UrbanCode Deploy | 7.1.1.1 |
| UCD - IBM UrbanCode Deploy | 7.0.5.3 |
| UCD - IBM UrbanCode Deploy | 7.1.1.2 |
| UCD - IBM UrbanCode Deploy | 7.1.1.0 |
| UCD - IBM UrbanCode Deploy | 7.1.0.0 |
| UCD - IBM UrbanCode Deploy | 7.0.5.4 |
| UCD - IBM UrbanCode Deploy | 6.2.7.4 |
| UCD - IBM UrbanCode Deploy | 6.2.7.3 |
| UCD - IBM UrbanCode Deploy | 6.2.7.8 |
| UCD - IBM UrbanCode Deploy | 7.0.4.0 |
| UCD - IBM UrbanCode Deploy | 6.2.7.9 |
| UCD - IBM UrbanCode Deploy | 7.0.3.0 |
| UCD - IBM UrbanCode Deploy | All |
Remediation/Fixes
Update to 7.2.0.2, 7.1.2.3, 7.0.5.7, 6.2.7.12 or later
Workarounds and Mitigations
None
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References
Change History
01 Sep 2021: Initial Publication
*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.
Disclaimer
Review the IBM security bulletin disclaimer and definitions regarding your responsibilities for assessing potential impact of security vulnerabilities to your environment.
Document Location
Worldwide
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Document Information
Modified date:
01 September 2021
UID
ibm16485649