The version of Apache Tomcat installed on the remote host is 10.0.3 to 10.0.4, 9.0.44 or 8.5.64. It is, therefore, affected by a denial of service due to an error introduced as part of a change to improve error handling during non-blocking I/O.

Note that the scanner has not attempted to exploit these issues but has instead relied only on the application's self-reported version number.

rbeaudry reports :

A vulnerability in Apache Tomcat allows an attacker to remotely trigger a denial of service. An error introduced as part of a change to improve error handling during non-blocking I/O meant that the error flag associated with the Request object was not reset between requests. This meant that once a non-blocking I/O error occurred, all future requests handled by that request object would fail. Users were able to trigger non-blocking I/O errors, e.g. by dropping a connection, thereby creating the possibility of triggering a DoS.

Applications that do not use non-blocking I/O are not exposed to this vulnerability. This issue affects Apache Tomcat 10.0.3 to 10.0.4;
9.0.44; 8.5.64.

The remote host is affected by the vulnerability described in GLSA-202208-34 (Apache Tomcat: Multiple Vulnerabilities)

  - When responding to new h2c connection requests, Apache Tomcat versions 10.0.0-M1 to 10.0.0, 9.0.0.M1 to     9.0.41 and 8.5.0 to 8.5.61 could duplicate request headers and a limited amount of request body from one     request to another meaning user A and user B could both see the results of user A's request.
    (CVE-2021-25122)

  - The fix for CVE-2020-9484 was incomplete. When using Apache Tomcat 10.0.0-M1 to 10.0.0, 9.0.0.M1 to     9.0.41, 8.5.0 to 8.5.61 or 7.0.0. to 7.0.107 with a configuration edge case that was highly unlikely to be     used, the Tomcat instance was still vulnerable to CVE-2020-9494. Note that both the previously published     prerequisites for CVE-2020-9484 and the previously published mitigations for CVE-2020-9484 also apply to     this issue. (CVE-2021-25329)

  - A vulnerability in Apache Tomcat allows an attacker to remotely trigger a denial of service. An error     introduced as part of a change to improve error handling during non-blocking I/O meant that the error flag     associated with the Request object was not reset between requests. This meant that once a non-blocking I/O     error occurred, all future requests handled by that request object would fail. Users were able to trigger     non-blocking I/O errors, e.g. by dropping a connection, thereby creating the possibility of triggering a     DoS. Applications that do not use non-blocking I/O are not exposed to this vulnerability. This issue     affects Apache Tomcat 10.0.3 to 10.0.4; 9.0.44; 8.5.64. (CVE-2021-30639)

  - A vulnerability in the JNDI Realm of Apache Tomcat allows an attacker to authenticate using variations of     a valid user name and/or to bypass some of the protection provided by the LockOut Realm. This issue     affects Apache Tomcat 10.0.0-M1 to 10.0.5; 9.0.0.M1 to 9.0.45; 8.5.0 to 8.5.65. (CVE-2021-30640)

  - 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.
    (CVE-2021-33037)

  - The fix for bug 63362 present in Apache Tomcat 10.1.0-M1 to 10.1.0-M5, 10.0.0-M1 to 10.0.11, 9.0.40 to     9.0.53 and 8.5.60 to 8.5.71 introduced a memory leak. The object introduced to collect metrics for HTTP     upgrade connections was not released for WebSocket connections once the connection was closed. This     created a memory leak that, over time, could lead to a denial of service via an OutOfMemoryError.
    (CVE-2021-42340)

  - In Apache Tomcat 10.1.0-M1 to 10.1.0-M16, 10.0.0-M1 to 10.0.22, 9.0.30 to 9.0.64 and 8.5.50 to 8.5.81 the     Form authentication example in the examples web application displayed user provided data without     filtering, exposing a XSS vulnerability. (CVE-2022-34305)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Tomcat installed on the remote host is prior to 10.0.5. It is, therefore, affected by a vulnerability as referenced in the fixed_in_apache_tomcat_10.0.5_security-10 advisory.

  - A vulnerability in Apache Tomcat allows an attacker to remotely trigger a denial of service. An error     introduced as part of a change to improve error handling during non-blocking I/O meant that the error flag     associated with the Request object was not reset between requests. This meant that once a non-blocking I/O     error occurred, all future requests handled by that request object would fail. Users were able to trigger     non-blocking I/O errors, e.g. by dropping a connection, thereby creating the possibility of triggering a     DoS. Applications that do not use non-blocking I/O are not exposed to this vulnerability. This issue     affects Apache Tomcat 10.0.3 to 10.0.4; 9.0.44; 8.5.64. (CVE-2021-30639)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The version of Tomcat installed on the remote host is prior to 9.0.45. It is, therefore, affected by a vulnerability as referenced in the fixed_in_apache_tomcat_9.0.45_security-9 advisory.

  - A vulnerability in Apache Tomcat allows an attacker to remotely trigger a denial of service. An error     introduced as part of a change to improve error handling during non-blocking I/O meant that the error flag     associated with the Request object was not reset between requests. This meant that once a non-blocking I/O     error occurred, all future requests handled by that request object would fail. Users were able to trigger     non-blocking I/O errors, e.g. by dropping a connection, thereby creating the possibility of triggering a     DoS. Applications that do not use non-blocking I/O are not exposed to this vulnerability. This issue     affects Apache Tomcat 10.0.3 to 10.0.4; 9.0.44; 8.5.64. (CVE-2021-30639)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The version of Tomcat installed on the remote host is prior to 8.5.65. It is, therefore, affected by a vulnerability as referenced in the fixed_in_apache_tomcat_8.5.65_security-8 advisory.

  - A vulnerability in Apache Tomcat allows an attacker to remotely trigger a denial of service. An error     introduced as part of a change to improve error handling during non-blocking I/O meant that the error flag     associated with the Request object was not reset between requests. This meant that once a non-blocking I/O     error occurred, all future requests handled by that request object would fail. Users were able to trigger     non-blocking I/O errors, e.g. by dropping a connection, thereby creating the possibility of triggering a     DoS. Applications that do not use non-blocking I/O are not exposed to this vulnerability. This issue     affects Apache Tomcat 10.0.3 to 10.0.4; 9.0.44; 8.5.64. (CVE-2021-30639)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Published	Updated	Severity
112903	Apache Tomcat 10.0.3 < 10.0.5 Denial of Service	Web App Scanning	Component Vulnerability	7/19/2021	3/14/2023	high
112904	Apache Tomcat 9.0.44 Denial of Service	Web App Scanning	Component Vulnerability	7/19/2021	3/14/2023	high
112905	Apache Tomcat 8.5.64 Denial of Service	Web App Scanning	Component Vulnerability	7/19/2021	3/14/2023	high
152206	FreeBSD : tomcat -- Remote Denial of Service in multiple versions (cc7c85d9-f30a-11eb-b12b-fc4dd43e2b6a)	Nessus	FreeBSD Local Security Checks	8/4/2021	12/6/2023	high
164434	GLSA-202208-34 : Apache Tomcat: Multiple Vulnerabilities	Nessus	Gentoo Local Security Checks	8/25/2022	10/13/2023	high
151504	Apache Tomcat 10.0.3 < 10.0.5	Nessus	Web Servers	7/12/2021	5/23/2024	high
197840	Apache Tomcat 9.0.0 < 9.0.45	Nessus	Web Servers	5/23/2024	5/23/2024	high
197845	Apache Tomcat 8.5.0 < 8.5.65	Nessus	Web Servers	5/23/2024	5/23/2024	high

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