Vulnerability in Apache Tomcat
CVE-2016-8745
A bug in the error handling of the send file code for the NIO HTTP connector in Apache Tomcat 9.0.0.M1 to 9.0.0.M13, 8.5.0 to 8.5.8, 8.0.0.RC1 to 8.0.39, 7.0.0 to 7.0.73 and 6.0.16 to 6.0.48 resulted in the current Processor object being added to the Processor cache multiple times. This in turn meant that the same Processor could be used for concurrent requests. Sharing a Processor can result in information leakage between requests including, not not limited to, session ID and the response body. The bug was first noticed in 8.5.x onwards where it appears the refactoring of the Connector code for 8.5.x onwards made it more likely that the bug was observed. Initially it was thought that the 8.5.x refactoring introduced the bug but further investigation has shown that the bug is present in all currently supported Tomcat versions.
EPSS: 0.160 (96.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
Affected products
- Apache Tomcat — versions 7.0.0, 7.0.1, 7.0.2
- Apache Software Foundation Tomcat — versions 7.0.0 to 7.0.73, 8.0.0.RC1 to 8.0.39, 9.0.0.M1 to 9.0.0.M13
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security@apache.org (VDB Entry, Third Party Advisory, vdb-entry, x_refsource_BID)
- security@apache.org (VDB Entry, Third Party Advisory, vdb-entry, x_refsource_SECTRACK)
- security@apache.org (vendor-advisory, VDB Entry, Third Party Advisory, x_refsource_GENTOO)
- security@apache.org (x_refsource_CONFIRM)
- security@apache.org (x_refsource_CONFIRM)
- security@apache.org (x_refsource_CONFIRM)
- security@apache.org (x_refsource_REDHAT, vendor-advisory)
- security@apache.org (vendor-advisory, x_refsource_DEBIAN)
- security@apache.org (x_refsource_REDHAT, vendor-advisory)
- security@apache.org (vendor-advisory, x_refsource_DEBIAN)
Frequently asked questions
- What is CVE-2016-8745?
- CVE-2016-8745 is a high-severity vulnerability in Apache Tomcat, classified under CWE-388. CVSS score: 7.5/10. Published 2017-08-10.
- How severe is CVE-2016-8745?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2016-8745 known to be exploited?
- 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.