Amazon Linux 2023 Security Advisory: ALAS2023-2025-911
Advisory Released Date: 2025-04-01
Advisory Updated Date: 2026-07-07
Path Equivalence: 'file.Name' (Internal Dot) leading to Remote Code Execution and/or Information disclosure and/or malicious content added to uploaded files via write enabled Default Servlet in Apache Tomcat.
This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.2, from 10.1.0-M1 through 10.1.34, from 9.0.0.M1 through 9.0.98.
If all of the following were true, a malicious user was able to view security sensitive files and/or inject content into those files:
- writes enabled for the default servlet (disabled by default)
- support for partial PUT (enabled by default)
- a target URL for security sensitive uploads that was a sub-directory of a target URL for public uploads
- attacker knowledge of the names of security sensitive files being uploaded
- the security sensitive files also being uploaded via partial PUT
If all of the following were true, a malicious user was able to perform remote code execution:
- writes enabled for the default servlet (disabled by default)
- support for partial PUT (enabled by default)
- application was using Tomcat's file based session persistence with the default storage location
- application included a library that may be leveraged in a deserialization attack
Users are recommended to upgrade to version 11.0.3, 10.1.35, 9.0.99 or later, which fixes the issue.
More justification and the patch links are available for all versions here:
[1] https://tomcat.apache.org/security-11.html
[2] https://tomcat.apache.org/security-10.html
[3] https://tomcat.apache.org/security-9.html (CVE-2025-24813)
Missing Critical Step in Authentication vulnerability in Apache Tomcat when the JNDIRealm was configured to authenticate binds using GSSAPI allowed attackers to authenticate without provided the correct password.
This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.4, from 10.1.0-M1 through 10.1.36, from 9.0.0.M1 through 9.0.100, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109.
Users are recommended to upgrade to version 11.0.5, 10.1.37 or 9.0.101, which fixes the issue. (CVE-2026-55957)
Affected Packages:
tomcat9
Issue Correction:
Run dnf update tomcat9 --releasever 2023.7.20250331 or dnf update --advisory ALAS2023-2025-911 --releasever 2023.7.20250331 to update your system.
More information on how to update your system can be found on this page: Amazon Linux 2023 documentation
noarch:
tomcat9-servlet-4.0-api-9.0.102-1.amzn2023.0.1.noarch
tomcat9-webapps-9.0.102-1.amzn2023.0.1.noarch
tomcat9-9.0.102-1.amzn2023.0.1.noarch
tomcat9-admin-webapps-9.0.102-1.amzn2023.0.1.noarch
tomcat9-el-3.0-api-9.0.102-1.amzn2023.0.1.noarch
tomcat9-docs-webapp-9.0.102-1.amzn2023.0.1.noarch
tomcat9-jsp-2.3-api-9.0.102-1.amzn2023.0.1.noarch
tomcat9-lib-9.0.102-1.amzn2023.0.1.noarch
src:
tomcat9-9.0.102-1.amzn2023.0.1.src
2026-07-07: CVE-2026-55957 was added to this advisory.