Description
Apache Tomcat 6.x before 6.0.37 and 7.x before 7.0.30 does not properly handle chunk extensions in chunked transfer coding, which allows remote attackers to cause a denial of service by streaming data.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 7 | tomcat6 | 6.0.35-6+deb7u1 | DSA-2725-1 |
| Debian 7 | tomcat7 | 7.0.28-4+deb7u1 | DSA-2897-1 |
| Debian 6.0 | tomcat6 | 6.0.35-1+squeeze3 | DSA-2725-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat JBoss Web Server 2 | apache-commons-daemon-eap6 | 1:1.0.15-4.redhat_1.ep6.el5 | RHSA-2013:1012, RHSA-2013:1011 |
| Red Hat JBoss Web Server 2 | apache-commons-daemon-jsvc-eap6 | 1:1.0.15-1.redhat_1.ep6.el5 | RHSA-2013:1012, RHSA-2013:1011 |
| Red Hat JBoss Web Server 2 | apache-commons-pool-eap6 +1 | 1.6-6.redhat_4.ep6.el5 | RHSA-2013:1012, RHSA-2013:1011 |
| Red Hat JBoss Web Server 2 | dom4j | 1.6.1-19.redhat_5.ep6.el5 | RHSA-2013:1012, RHSA-2013:1011 |
| Red Hat JBoss Web Server 2 | ecj3 | 1:3.7.2-6.redhat_1.ep6.el5 | RHSA-2013:1012, RHSA-2013:1011 |
| Red Hat JBoss Web Server 2 | httpd +3 | 2.2.22-23.ep6.el5 | RHSA-2013:1012, RHSA-2013:1011 |
| Red Hat JBoss Web Server 2 | mod_cluster +3 | 1.2.4-1.Final_redhat_1.ep6.el5 | RHSA-2013:1012, RHSA-2013:1011 |
| Red Hat JBoss Web Server 2 | mod_cluster-native | 1.2.4-1.Final.redhat_1.ep6.el5 | RHSA-2013:1012, RHSA-2013:1011 |
| Red Hat JBoss Web Server 2 | mod_jk +2 | 1.2.37-2.redhat_1.ep6.el5 | RHSA-2013:1012, RHSA-2013:1011 |
| Red Hat JBoss Web Server 2 | mod_ssl | 1:2.2.22-23.ep6.el5 | RHSA-2013:1012, RHSA-2013:1011 |
| Red Hat JBoss Web Server 2 | tomcat-native | 1.1.27-4.redhat_1.ep6.el5 | RHSA-2013:1012, RHSA-2013:1011 |
| Red Hat JBoss Web Server 2 | tomcat6 +9 | 6.0.37-8_patch_01.ep6.el5 | RHSA-2013:1012, RHSA-2013:1011 |
| Red Hat JBoss Web Server 2 | tomcat7 +9 | 7.0.40-5_patch_01.ep6.el6 | RHSA-2013:1012, RHSA-2013:1011 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Maven | org.apache.tomcat:tomcat | >= 6.0.0, < 6.0.37 | 6.0.37 | GHSA-qfxv-3ppc-7qg5 |
| Maven | org.apache.tomcat:tomcat | >= 7.0.0, < 7.0.30 | 7.0.30 | GHSA-qfxv-3ppc-7qg5 |
Advisories 4
- RHSA-2013:1012 Red Hat Security Advisory: Red Hat JBoss Web Server 2.0.1 update Red Hat Security Advisories (RHSA) · Aug 5, 2026
- RHSA-2013:1011 Red Hat Security Advisory: Red Hat JBoss Web Server 2.0.1 update Red Hat Security Advisories (RHSA) · Aug 5, 2026
- DSA-2725-1 tomcat6 - several Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-2897-1 tomcat7 - security update Debian Security (DSA / DLA) · Mar 9, 2026
References
- http://svn.apache.org/viewvc?view=revision&revision=1378702
- 59797 vdb-entry
- http://svn.apache.org/viewvc?view=revision&revision=1378921
- http://www.vmware.com/security/advisories/VMSA-2014-0012.html
- http://tomcat.apache.org/security-7.html
- 20141205 NEW: VMSA-2014-0012 - VMware vSphere product updates address security vulnerabilities mailing-list
- http://svn.apache.org/viewvc?view=revision&revision=1476592
- http://svn.apache.org/viewvc/tomcat/tc6.0.x/trunk/java/org/apache/coyote/http11/filters/ChunkedInputFilter.java?r1=1476592&r2=1476591&pathrev=1476592
- http://tomcat.apache.org/security-6.html
- http://www.oracle.com/technetwork/topics/security/cpujul2014-1972956.html
- 20141205 NEW: VMSA-2014-0012 - VMware vSphere product updates address security vulnerabilities mailing-list
- 20130510 [SECURITY] CVE-2012-3544 Chunked transfer encoding extension size is not limited mailing-list
- USN-1841-1 vendor-advisory
- 64758 vdb-entry
- http://www.oracle.com/technetwork/topics/security/cpujan2014-1972949.html
- [tomcat-dev] 20190319 svn commit: r1855831 [23/30] - in /tomcat/site/trunk: ./ docs/ xdocs/ mailing-list
- [tomcat-dev] 20190325 svn commit: r1856174 [21/29] - in /tomcat/site/trunk: docs/ xdocs/ xdocs/stylesheets/ mailing-list
- [tomcat-dev] 20190413 svn commit: r1857494 [15/20] - in /tomcat/site/trunk: ./ docs/ xdocs/ mailing-list
- [tomcat-dev] 20190415 svn commit: r1857582 [16/22] - in /tomcat/site/trunk: docs/ xdocs/stylesheets/ mailing-list
- [tomcat-dev] 20200203 svn commit: r1873527 [23/30] - /tomcat/site/trunk/docs/ mailing-list
- [tomcat-dev] 20200213 svn commit: r1873980 [26/34] - /tomcat/site/trunk/docs/ mailing-list