CVE-2019-17638

NameCVE-2019-17638
DescriptionIn 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).
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severityhigh

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
jetty9 (PTS)stretch (security), stretch9.2.21-1+deb9u1fixed
buster9.4.15-1fixed
bullseye, sid9.4.33-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
jetty9sourcestretch(not affected)
jetty9sourcebuster(not affected)
jetty9source(unstable)9.4.31-1

Notes

[buster] - jetty9 <not-affected> (vulnerable code was introduced in 9.4.27)
[stretch] - jetty9 <not-affected> (vulnerable code was introduced in 9.4.27)
https://bugs.eclipse.org/bugs/show_bug.cgi?id=564984
https://github.com/eclipse/jetty.project/issues/4936

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