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CVE-2016-6817: Improper Restriction of Operations within the Bounds of a Memory Buffer in Apache Tomcat

May 14, 2022 (updated October 15, 2024)

The HTTP/2 header parser in Apache Tomcat 9.0.0.M1 to 9.0.0.M11 and 8.5.0 to 8.5.6 entered an infinite loop if a header was received that was larger than the available buffer. This made a denial of service attack possible.

References

  • github.com/advisories/GHSA-698c-2x4j-g9gq
  • github.com/apache/tomcat
  • github.com/apache/tomcat/commit/079372fc7bac8e2e378942715c9ce26a4a72c07a
  • github.com/apache/tomcat/commit/85c63227edabbfb4f2f500fc557480a190135d21
  • lists.apache.org/thread.html/343558d982879bf88ec20dbf707f8c11255f8e219e81d45c4f8d0551%40%3Cdev.tomcat.apache.org%3E
  • lists.apache.org/thread.html/343558d982879bf88ec20dbf707f8c11255f8e219e81d45c4f8d0551@%3Cdev.tomcat.apache.org%3E
  • lists.apache.org/thread.html/6af47120905aa7d8fe12f42e8ff2284fb338ba141d3b77b8c7cb61b3%40%3Cdev.tomcat.apache.org%3E
  • lists.apache.org/thread.html/6af47120905aa7d8fe12f42e8ff2284fb338ba141d3b77b8c7cb61b3@%3Cdev.tomcat.apache.org%3E
  • lists.apache.org/thread.html/88855876c33f2f9c532ffb75bfee570ccf0b17ffa77493745af9a17a%40%3Cdev.tomcat.apache.org%3E
  • lists.apache.org/thread.html/88855876c33f2f9c532ffb75bfee570ccf0b17ffa77493745af9a17a@%3Cdev.tomcat.apache.org%3E
  • lists.apache.org/thread.html/a9f24571460af003071475b75f18cad81ebcc36fa7c876965a75e32a%40%3Cannounce.tomcat.apache.org%3E
  • lists.apache.org/thread.html/a9f24571460af003071475b75f18cad81ebcc36fa7c876965a75e32a@%3Cannounce.tomcat.apache.org%3E
  • lists.apache.org/thread.html/b5e3f51d28cd5d9b1809f56594f2cf63dcd6a90429e16ea9f83bbedc%40%3Cdev.tomcat.apache.org%3E
  • lists.apache.org/thread.html/b5e3f51d28cd5d9b1809f56594f2cf63dcd6a90429e16ea9f83bbedc@%3Cdev.tomcat.apache.org%3E
  • nvd.nist.gov/vuln/detail/CVE-2016-6817
  • security.netapp.com/advisory/ntap-20180607-0001
  • web.archive.org/web/20180115024458/http://www.securitytracker.com/id/1037330
  • web.archive.org/web/20200227174145/http://www.securityfocus.com/bid/94462

Code Behaviors & Features

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Affected versions

All versions starting from 9.0.0.M1 before 9.0.0.M12, all versions starting from 8.5.0 before 8.5.8

Fixed versions

  • 9.0.0.M12
  • 8.5.8

Solution

Upgrade to versions 8.5.8, 9.0.0.M12 or above.

Impact 7.5 HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Learn more about CVSS

Weakness

  • CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer
  • CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')

Source file

maven/org.apache.tomcat/tomcat/CVE-2016-6817.yml

Spotted a mistake? Edit the file on GitLab.

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