CVE-2021-24122: Infoleak

When serving resources from a network location using the NTFS file system it was possible to bypass security constraints and/or view the source code for JSPs in some configurations. The root cause was the unexpected behaviour of the JRE API File.getCanonicalPath() which in turn was caused by the inconsistent behaviour of the Windows API (FindFirstFileW) in some circumstances.

Upstream commits: Tomcat 9.0: https://github.com/apache/tomcat/commit/935fc5582dc25ae10bab6f9d5629ff8d996cb533 Tomcat 8.5: https://github.com/apache/tomcat/commit/920dddbdb981f92e8d5872a4bb126a10af5ca8a9 Tomcat 7.0: https://github.com/apache/tomcat/commit/800b03140e640f8892f27021e681645e8e320177

Reference: http://mail-archives.apache.org/modmbox/tomcat-announce/202101.mbox/%3Cf3765f21-969d-7f21-e34a-efc106175373%40apache.org%3E http://tomcat.apache.org/security-9.html#FixedinApacheTomcat9.0.40 http://tomcat.apache.org/security-8.html#FixedinApacheTomcat8.5.60 http://tomcat.apache.org/security-7.html#FixedinApacheTomcat7.0.107

— Red Hat

When serving resources from a network location using the NTFS file system, Apache Tomcat versions 10.0.0-M1 to 10.0.0-M9, 9.0.0.M1 to 9.0.39, 8.5.0 to 8.5.59 and 7.0.0 to 7.0.106 were susceptible to JSP source code disclosure in some configurations. The root cause was the unexpected behaviour of the JRE API File.getCanonicalPath() which in turn was caused by the inconsistent behaviour of the Windows API (FindFirstFileW) in some circumstances.