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Bug 1628702 - (CVE-2018-14642) CVE-2018-14642 undertow: Infoleak in some circumstances where Undertow can serve data from a random buffer
CVE-2018-14642 undertow: Infoleak in some circumstances where Undertow can se...
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20180914,repor...
: Security
Depends On:
Blocks: 1628704
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Reported: 2018-09-13 14:24 EDT by Pedro Sampaio
Modified: 2018-10-19 17:53 EDT (History)
53 users (show)

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Description Pedro Sampaio 2018-09-13 14:24:25 EDT 
In some circumstances Undertow can serve data from a random ByteBuffer, this is due to an incomplete fix for UNDERTOW-438.

Basically if all the headers are not written out in the first write() call then the code that handles flushing the buffer will always write out the full contents of the writevBuffer buffer, which may contain data from previous requests.

Upstream bug:

https://issues.jboss.org/browse/JBEAP-15428

Upstream patch:

https://github.com/jbossas/redhat-undertow/commit/e65ad5b410f95b166ff04f876e22f873e9b4ce62
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