CVE-2019-17638 Information

Description

In Eclipse Jetty versions 9.4.27.v20200227 to 9.4.29.v20200521 in case of too large response headers Jetty throws an exception to produce an HTTP 431 error. When this happens the ByteBuffer containing the HTTP response headers is released back to the ByteBufferPool twice. Because of this double release two threads can acquire the same ByteBuffer from the pool and while thread1 is about to use the ByteBuffer to write response1 data thread2 fills the ByteBuffer with other data. Thread1 then proceeds to write the buffer that now contains different data. This results in client1 which issued request1 seeing data from another request or response which could contain sensitive data belonging to client2 (HTTP session ids authentication credentials etc.). If the Jetty version cannot be upgraded the vulnerability can be significantly reduced by configuring a responseHeaderSize significantly larger than the requestHeaderSize (12KB responseHeaderSize and 8KB requestHeaderSize).

CVSS Vector

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

Reference

http://www.openwall.com/lists/oss-security/2020/08/17/1 https://bugs.eclipse.org/bugs/show_bug.cgi?id=564984 https://lists.apache.org/thread.html/r29073905dc9139d0d7a146595694bf57bb9e35e5ec6aa73eb9c8443a@3Ccommits.pulsar.apache.org3E https://lists.apache.org/thread.html/r378e4cdec15e132575aa1dcb6296ffeff2a896745a8991522e266ad4@3Ccommits.pulsar.apache.org3E https://lists.apache.org/thread.html/r4bdd3f7bb6820a79f9416b6667d718a06d269018619a75ce4b759318@3Ccommits.pulsar.apache.org3E https://lists.apache.org/thread.html/r521168299e023fb075b57afe33d17ff1d09e8a10e0fd8c775ea0e028@3Ccommits.pulsar.apache.org3E https://lists.apache.org/thread.html/r7fc5f2ed49641ea91c433e3cd0fc3d31c0278c87b82b15c33b881415@3Ccommits.pulsar.apache.org3E https://lists.apache.org/thread.html/r81f58591fb4716fb867b36956f30c7c8ad4ab3f23abc952d9d86a2a0@3Ccommits.pulsar.apache.org3E https://lists.apache.org/thread.html/r9a2cfa56d30782a0c17a5deb951a622d1f5c8de48e1c3b578ffc2a84@3Ccommits.pulsar.apache.org3E https://lists.apache.org/thread.html/ra8661fc8c69c647cb06153c1485d48484a833d873f75dfe45937e9de@3Ccommits.pulsar.apache.org3E https://lists.apache.org/thread.html/rbe1f230e87ea947593145d0072d0097ddb0af10fee1161db8ca1546c@3Ccommits.pulsar.apache.org3E https://lists.apache.org/thread.html/rd98cfd012490cb02caa1a11aaa0cc38bff2d43bcce9b20c2f01063dd@3Ccommits.pulsar.apache.org3E https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XE6US6VPZHOWFMUSFGDS5V2DNQPY5MKB/ https://www.oracle.com/security-alerts/cpuoct2020.html

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

LOW

Base Severity

9.4