CVE-2023-45648: Apache Tomcat: Trailer header parsing too lenient

Published Oct 10, 2023
·
Updated

Improper Input Validation vulnerability in Apache Tomcat.

Tomcat from 11.0.0-M1 through 11.0.0-M11, from 10.1.0-M1 through 10.1.13, from 9.0.0-M1 through 9.0.81 and from 8.5.0 through 8.5.93 did not correctly parse HTTP trailer headers. A specially crafted, invalid trailer header could cause Tomcat to treat a single request as multiple requests leading to the possibility of request smuggling when behind a reverse proxy.

Users are recommended to upgrade to version 11.0.0-M12 onwards, 10.1.14 onwards, 9.0.81 onwards or 8.5.94 onwards, which fix the issue.

Other sources

Improper Input Validation vulnerability in Apache Tomcat.Tomcat from 11.0.0-M1 through 11.0.0-M11, from 10.1.0-M1 through 10.1.13, from 9.0.0-M1 through 9.0.81 and from 8.5.0 through 8.5.93 did not correctly parse HTTP trailer headers. A specially crafted, invalid trailer header could cause Tomcat to treat a single request as multiple requests leading to the possibility of request smuggling when behind a reverse proxy.

Older, EOL versions may also be affected.

Users are recommended to upgrade to version 11.0.0-M12 onwards, 10.1.14 onwards, 9.0.81 onwards or 8.5.94 onwards, which fix the issue.

— NVD

Improper Input Validation vulnerability in Apache Tomcat.Tomcat from 11.0.0-M1 through 11.0.0-M11, from 10.1.0-M1 through 10.1.13, from 9.0.0-M1 through 9.0.81 and from 8.5.0 through 8.5.93 did not correctly parse HTTP trailer headers. A specially crafted, invalid trailer header could cause Tomcat to treat a single request as multiple requests leading to the possibility of request smuggling when behind a reverse proxy.

Users are recommended to upgrade to version 11.0.0-M12 onwards, 10.1.14 onwards, 9.0.81 onwards or 8.5.94 onwards, which fix the issue.

— NVD

Affected Software

79 affected componentsFixes available
debian/tomcat10
10.1.6-1+deb12u110.1.16-1
debian/tomcat9<=9.0.31-1~deb10u6, <=9.0.43-2~deb11u6
9.0.31-1~deb10u109.0.43-2~deb11u99.0.70-2
maven/org.apache.tomcat.embed:tomcat-embed-core>=8.5.0<8.5.94
8.5.94
maven/org.apache.tomcat.embed:tomcat-embed-core>=9.0.0-M1<9.0.81
9.0.81
maven/org.apache.tomcat.embed:tomcat-embed-core>=10.1.0-M1<10.1.14
10.1.14
maven/org.apache.tomcat.embed:tomcat-embed-core>=11.0.0-M1<11.0.0-M12
11.0.0-M12
maven/org.apache.tomcat:tomcat>=8.5.0<8.5.94
8.5.94
maven/org.apache.tomcat:tomcat>=9.0.0-M1<9.0.81
9.0.81
maven/org.apache.tomcat:tomcat>=10.1.0-M1<10.1.14
10.1.14
maven/org.apache.tomcat:tomcat>=11.0.0-M1<11.0.0-M12
11.0.0-M12
Apache Tomcat>=8.5.0<8.5.94
Apache Tomcat>=9.0.1<9.0.81
Apache Tomcat>=10.1.1<10.1.14
Apache Tomcat=9.0.0-milestone1
Apache Tomcat=9.0.0-milestone10
Apache Tomcat=9.0.0-milestone11
Apache Tomcat=9.0.0-milestone12
Apache Tomcat=9.0.0-milestone13
Apache Tomcat=9.0.0-milestone14
Apache Tomcat=9.0.0-milestone15
Apache Tomcat=9.0.0-milestone16
Apache Tomcat=9.0.0-milestone17
Apache Tomcat=9.0.0-milestone18
Apache Tomcat=9.0.0-milestone19
Apache Tomcat=9.0.0-milestone2
Apache Tomcat=9.0.0-milestone20
Apache Tomcat=9.0.0-milestone21
Apache Tomcat=9.0.0-milestone22
Apache Tomcat=9.0.0-milestone23
Apache Tomcat=9.0.0-milestone24
Apache Tomcat=9.0.0-milestone25
Apache Tomcat=9.0.0-milestone26
Apache Tomcat=9.0.0-milestone27
Apache Tomcat=9.0.0-milestone3
Apache Tomcat=9.0.0-milestone4
Apache Tomcat=9.0.0-milestone5
Apache Tomcat=9.0.0-milestone6
Apache Tomcat=9.0.0-milestone7
Apache Tomcat=9.0.0-milestone8
Apache Tomcat=9.0.0-milestone9
Apache Tomcat=10.1.0-milestone1
Apache Tomcat=10.1.0-milestone10
Apache Tomcat=10.1.0-milestone11
Apache Tomcat=10.1.0-milestone12
Apache Tomcat=10.1.0-milestone13
Apache Tomcat=10.1.0-milestone14
Apache Tomcat=10.1.0-milestone15
Apache Tomcat=10.1.0-milestone16
Apache Tomcat=10.1.0-milestone17
Apache Tomcat=10.1.0-milestone18
Apache Tomcat=10.1.0-milestone19
Apache Tomcat=10.1.0-milestone2
Apache Tomcat=10.1.0-milestone20
Apache Tomcat=10.1.0-milestone3
Apache Tomcat=10.1.0-milestone4
Apache Tomcat=10.1.0-milestone5
Apache Tomcat=10.1.0-milestone6
Apache Tomcat=10.1.0-milestone7
Apache Tomcat=10.1.0-milestone8
Apache Tomcat=10.1.0-milestone9
Apache Tomcat=11.0.0-milestone1
Apache Tomcat=11.0.0-milestone10
Apache Tomcat=11.0.0-milestone11
Apache Tomcat=11.0.0-milestone2
Apache Tomcat=11.0.0-milestone3
Apache Tomcat=11.0.0-milestone4
Apache Tomcat=11.0.0-milestone5
Apache Tomcat=11.0.0-milestone6
Apache Tomcat=11.0.0-milestone7
Apache Tomcat=11.0.0-milestone8
Apache Tomcat=11.0.0-milestone9
Debian Debian Linux=10.0
Debian Debian Linux=11.0
Debian Debian Linux=12.0
redhat/tomcat<11.0.0
11.0.0
redhat/tomcat<10.1.14
10.1.14
redhat/tomcat<9.0.81
9.0.81
redhat/tomcat<8.5.94
8.5.94
IBM API Connect V12 OnPrem<=All

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade debian/tomcat10 to a version that resolves this vulnerability.

    Fixed in 10.1.6-1+deb12u1Fixed in 10.1.16-1
  2. Upgrade

    Upgrade debian/tomcat9 to a version that resolves this vulnerability.

    Fixed in 9.0.31-1~deb10u10Fixed in 9.0.43-2~deb11u9Fixed in 9.0.70-2
  3. Upgrade

    Upgrade maven/org.apache.tomcat.embed:tomcat-embed-core to a version that resolves this vulnerability.

    Fixed in 8.5.94
  4. Upgrade

    Upgrade maven/org.apache.tomcat.embed:tomcat-embed-core to a version that resolves this vulnerability.

    Fixed in 9.0.81
  5. Upgrade

    Upgrade maven/org.apache.tomcat.embed:tomcat-embed-core to a version that resolves this vulnerability.

    Fixed in 10.1.14
  6. Upgrade

    Upgrade maven/org.apache.tomcat.embed:tomcat-embed-core to a version that resolves this vulnerability.

    Fixed in 11.0.0-M12
  7. Upgrade

    Upgrade maven/org.apache.tomcat:tomcat to a version that resolves this vulnerability.

    Fixed in 8.5.94
  8. Upgrade

    Upgrade maven/org.apache.tomcat:tomcat to a version that resolves this vulnerability.

    Fixed in 9.0.81
  9. Upgrade

    Upgrade maven/org.apache.tomcat:tomcat to a version that resolves this vulnerability.

    Fixed in 10.1.14
  10. Upgrade

    Upgrade maven/org.apache.tomcat:tomcat to a version that resolves this vulnerability.

    Fixed in 11.0.0-M12
  11. Upgrade

    Upgrade redhat/tomcat to a version that resolves this vulnerability.

    Fixed in 11.0.0
  12. Upgrade

    Upgrade redhat/tomcat to a version that resolves this vulnerability.

    Fixed in 10.1.14
  13. Upgrade

    Upgrade redhat/tomcat to a version that resolves this vulnerability.

    Fixed in 9.0.81
  14. Upgrade

    Upgrade redhat/tomcat to a version that resolves this vulnerability.

    Fixed in 8.5.94
  15. Upgrade

    Upgrade Apache Tomcat to a version that resolves this vulnerability.

    Fixed in 11.0.0-M12 onwards
  16. Upgrade

    Upgrade Apache Tomcat to a version that resolves this vulnerability.

    Fixed in 10.1.14 onwards
  17. Upgrade

    Upgrade Apache Tomcat to a version that resolves this vulnerability.

    Fixed in 9.0.81 onwards
  18. Upgrade

    Upgrade Apache Tomcat to a version that resolves this vulnerability.

    Fixed in 8.5.94 onwards

Event History

Oct 10, 2023
CVE Published
via MITRE·06:38 PM
Data Sourced
via MITRE·06:38 PM
DescriptionWeakness
Data Sourced
via NVD·07:15 PM
DescriptionSeverityWeaknessAffected Software
Advisory Published
via GitHub·09:31 PM
Oct 12, 2023
Data Sourced
via Red Hat·09:23 PM
DescriptionSeverityAffected Software
Jul 7, 2026
Data Sourced
via IBM·12:00 AM
DescriptionAffected Software

Parent advisories

This vulnerability appears in the following advisories.

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Frequently Asked Questions

1

What is CVE-2023-45648?

CVE-2023-45648 is a vulnerability in Apache Tomcat that allows for improper input validation.

2

Which versions of Apache Tomcat are affected by CVE-2023-45648?

Apache Tomcat versions 11.0.0-M1 through 11.0.0-M11, 10.1.0-M1 through 10.1.13, 9.0.0-M1 through 9.0.81, and 8.5.0 through 8.5.93 are affected by CVE-2023-45648.

3

How can a specially crafted trailer header exploit CVE-2023-45648?

A specially crafted, invalid trailer header can exploit CVE-2023-45648 by causing Tomcat to incorrectly parse HTTP trailer headers.

4

What is the severity of CVE-2023-45648?

The severity of CVE-2023-45648 is not specified.

5

How can I fix CVE-2023-45648?

To fix CVE-2023-45648, update Apache Tomcat to versions 8.5.94, 9.0.81, 10.1.14, or 11.0.0-M12 depending on the affected version.

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