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CVE-2020-1938

Description

When using the Apache JServ Protocol (AJP), care must be taken when trusting incoming connections to Apache Tomcat. Tomcat treats AJP connections as having higher trust than, for example, a similar HTTP connection. If such connections are available to an attacker, they can be exploited in ways that may be surprising. In Apache Tomcat 9.0.0.M1 to 9.0.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99, Tomcat shipped with an AJP Connector enabled by default that listened on all configured IP addresses. It was expected (and recommended in the security guide) that this Connector would be disabled if not required. This vulnerability report identified a mechanism that allowed: – returning arbitrary files from anywhere in the web application – processing any file in the web application as a JSP Further, if the web application allowed file upload and stored those files within the web application (or the attacker was able to control the content of the web application by some other means) then this, along with the ability to process a file as a JSP, made remote code execution possible. It is important to note that mitigation is only required if an AJP port is accessible to untrusted users. Users wishing to take a defence-in-depth approach and block the vector that permits returning arbitrary files and execution as JSP may upgrade to Apache Tomcat 9.0.31, 8.5.51 or 7.0.100 or later. A number of changes were made to the default AJP Connector configuration in 9.0.31 to harden the default configuration. It is likely that users upgrading to 9.0.31, 8.5.51 or 7.0.100 or later will need to make small changes to their configurations. **Recent assessments:** **kevthehermit** at February 22, 2020 12:16am UTC reported: Current PoC’s offer unauthenticated LFI inside the webroot. Depending on the application and organisations configuration this could reveal sensitive information from database config or other configurations within the source code. There is the potential for RFI / RCE although example of this are not yet public. With a shift towards containers like Kubernetes / Docker it is important to note that older tags which may be version pinned by organisations are unlikely to be patched. The official containers distributed by Apache include tags for vulnerable version although they do not appear to server port 8009 by default. A custom server.xml is required. This is “Likely” to happen. **busterb** at February 24, 2020 5:15pm UTC reported: Current PoC’s offer unauthenticated LFI inside the webroot. Depending on the application and organisations configuration this could reveal sensitive information from database config or other configurations within the source code. There is the potential for RFI / RCE although example of this are not yet public. With a shift towards containers like Kubernetes / Docker it is important to note that older tags which may be version pinned by organisations are unlikely to be patched. The official containers distributed by Apache include tags for vulnerable version although they do not appear to server port 8009 by default. A custom server.xml is required. This is “Likely” to happen. **theguly** at March 04, 2020 3:54pm UTC reported: Current PoC’s offer unauthenticated LFI inside the webroot. Depending on the application and organisations configuration this could reveal sensitive information from database config or other configurations within the source code. There is the potential for RFI / RCE although example of this are not yet public. With a shift towards containers like Kubernetes / Docker it is important to note that older tags which may be version pinned by organisations are unlikely to be patched. The official containers distributed by Apache include tags for vulnerable version although they do not appear to server port 8009 by default. A custom server.xml is required. This is “Likely” to happen. **wvu-r7** at February 21, 2020 10:38pm UTC reported: Current PoC’s offer unauthenticated LFI inside the webroot. Depending on the application and organisations configuration this could reveal sensitive information from database config or other configurations within the source code. There is the potential for RFI / RCE although example of this are not yet public. With a shift towards containers like Kubernetes / Docker it is important to note that older tags which may be version pinned by organisations are unlikely to be patched. The official containers distributed by Apache include tags for vulnerable version although they do not appear to server port 8009 by default. A custom server.xml is required. This is “Likely” to happen. Assessed Attacker Value: 4 Assessed Attacker Value: 4Assessed Attacker Value: 5


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