BIT-tomcat-2021-30639

Dashboard / Vulnerabilities / BIT-tomcat-2021-30639

BIT-tomcat-2021-30639

Summary: DoS after non-blocking IO error

Details: 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.

References: https://kc.mcafee.com/corporate/index?page=content&id=SB10366, https://lists.apache.org/thread.html/r79a7c019712b39aedf7cf4da9276d80610f04441b2a4f6506cb2daaf%40%3Cdev.tomcat.apache.org%3E, https://lists.apache.org/thread.html/r79a7c019712b39aedf7cf4da9276d80610f04441b2a4f6506cb2daaf%40%3Cusers.tomcat.apache.org%3E, https://lists.apache.org/thread.html/rd84fae1f474597bdf358f5bdc0a5c453c507bd527b83e8be6b5ea3f4%40%3Cannounce.tomcat.apache.org%3E, https://security.gentoo.org/glsa/202208-34, https://security.netapp.com/advisory/ntap-20210827-0007/, https://www.oracle.com/security-alerts/cpujan2022.html, https://nvd.nist.gov/vuln/detail/CVE-2021-30639