29 September 2022
Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2022.4853 CVE-2021-43980 Apache Tomcat - Information Disclosure 29 September 2022 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Apache Tomcat Publisher: Apache Operating System: UNIX variants (UNIX, Linux, OSX) Windows Resolution: Patch/Upgrade CVE Names: CVE-2021-43980 Original Bulletin: https://tomcat.apache.org/security-10.html Comment: CVSS (Max): None available when published - --------------------------BEGIN INCLUDED TEXT-------------------- CVE-2021-43980 Apache Tomcat - Information Disclosure Severity: High Vendor: The Apache Software Foundation Versions Affected: Apache Tomcat 10.1.0-M1 to 10.1.0-M12 Apache Tomcat 10.0.0-M1 to 10.0.18 Apache Tomcat 9.0.0-M1 to 9.0.60 Apache Tomcat 8.5.0 to 8.5.77 Description: The simplified implementation of blocking reads and writes introduced in Tomcat 10 and back-ported to Tomcat 9.0.47 onwards exposed a long standing (but extremely hard to trigger) concurrency bug that could cause client connections to share an Http11Processor instance resulting in responses, or part responses, to be received by the wrong client. Mitigation: Users of the affected versions should apply one of the following mitigations: - - Upgrade to Apache Tomcat 10.1.0-M14 or later once released - - Upgrade to Apache Tomcat 10.0.20 or later once released - - Upgrade to Apache Tomcat 9.0.62 or later once released - - Upgrade to Apache Tomcat 8.5.78 or later once released - - Note 10.1.0-M13, 10.0.19 and 9.0.61 were not released Credit: Thanks to Adam Thomas, Richard Hernandez and Ryan Schmitt for discovering the issue and working with the Tomcat security team to identify the root cause and appropriate fix. History: 2022-09-28 Original advisory References:  https://tomcat.apache.org/security-10.html  https://tomcat.apache.org/security-9.html  https://tomcat.apache.org/security-8.html - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. 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It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: email@example.com Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: https://auscert.org.au/gpg-key/ iQIVAwUBYzUumckNZI30y1K9AQgs0A/6A4Nmg1mVwp6EZyJvaSA9lJ7tLchBxscz qSAm+fJMwuz4Dbw/4AxfAMzxM+AsGFXdQ1ySuXawt34CDxLWEsIIDcEq8hZz493G 4exdAtOXZEgWfUYMCO5aky0pxdIfVomYtvPuFW7Las7uRAIzNaFpYSnhn6tf86Ru 3MbiiKFO2elVxiIeNM3OfZpuZyt58MR50AKgKGVT84js0+yZpCAzcaxFtZUKLmvO qhlcubrAUKpWIhkKYocS75HhvK1X8K/ScV0c74P51Y3aoF1PhfFggMQOH6Zad7G1 r0iDCn6r61vO9C3C0YTnxra9P+aFhQhOBJ4S6beoqnX8hDyfFNVql6Jk5xjAbog4 tuehbZ04A3yk9/krtkJ+u6wyNzUKSoZZn5/cWTsEUidr38gLIdEgN11/NEQws+0k Se64RPYUHxTvSuaCVkbrdVDl5/qdQjxND2qooGvXo7CzrhkqEOV9gbRDNHdIpOHg lxWUE65FtGIhLIE/zecGlIDXti/NQBpTEhlDTi0DcdD7G0F0T3uD0v2zxl2Bk0cp iLsFMt/7ZOkvO2mburLaYKmgHARTrRe0b1u9Ajwk1zE9O6bi6ldHlJsvcaRsQxH7 wtn6m6Ikw8+rxBifGZWB90VIp6RV1AX61qOqOYfuPGgBxCd2H4KKvSEDj2nJ1EA6 5uwqxEpyOJw= =2Xnq -----END PGP SIGNATURE-----