cbcvebase.
CVE-2019-0199
published 2019-04-10

CVE-2019-0199: The HTTP/2 implementation in Apache Tomcat 9.0.0.M1 to 9.0.14 and 8.5.0 to 8.5.37 accepted streams with excessive numbers of SETTINGS frames and also permitted…

PriorityP358high7.5CVSS 3.0
AVNACLPRNUINSUCNINAH
EPSS
72.86%
99.4th percentile
The HTTP/2 implementation in Apache Tomcat 9.0.0.M1 to 9.0.14 and 8.5.0 to 8.5.37 accepted streams with excessive numbers of SETTINGS frames and also permitted clients to keep streams open without reading/writing request/response data. By keeping streams open for requests that utilised the Servlet API's blocking I/O, clients were able to cause server-side threads to block eventually leading to thread exhaustion and a DoS.

Affected

8 ranges
VendorProductVersion rangeFixed in
apachetomcat
apachetomcat
apachetomcat8.5.0 – 8.5.37
apachetomcat8.5.0 – 8.5.40
apachetomcat9.0.1 – 9.0.14
apachetomcat9.0.1 – 9.0.19
debiantomcat9< tomcat9 9.0.16-1 (bookworm)tomcat9 9.0.16-1 (bookworm)
debiantomcat9< tomcat9 9.0.22-1 (bookworm)tomcat9 9.0.22-1 (bookworm)

Detection & IOCsextracted from sources · hover to see the quote

  • Detect HTTP/2 clients sending excessive numbers of SETTINGS frames to Apache Tomcat, which can indicate exploitation of CVE-2019-0199
  • Monitor for server-side thread exhaustion on Tomcat instances with HTTP/2 enabled, particularly threads blocked on Servlet API blocking I/O with streams held open by clients not sending data
  • For the incomplete fix variant (CVE-2019-10072), detect HTTP/2 clients that do not trigger WINDOW_UPDATE messages for the connection window (stream 0), causing server-side thread blocking
  • ·pki-servlet-container is not vulnerable in its default configuration because HTTP/2 is not enabled by default
  • ·The fix for CVE-2019-0199 in Tomcat 9.0.0.M1–9.0.14 and 8.5.0–8.5.37 was incomplete; the related CVE-2019-10072 extends the vulnerable range to 9.0.0.M1–9.0.19 and 8.5.0–8.5.40 and requires a separate patch

CVSS provenance

nvdv3.07.5HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
nvdv2.05.0MEDIUMAV:N/AC:L/Au:N/C:N/I:N/A:P
ghsa7.5HIGH
osv7.5HIGH
vendor_apache7.5HIGH
vendor_debian7.5HIGH
vendor_redhat7.5HIGH
vendor_ubuntu7.5HIGH
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