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Bug 1640217 - (CVE-2018-1000807) CVE-2018-1000807 pyOpenSSL: Use-after-free in X509 object handling [NEEDINFO]
CVE-2018-1000807 pyOpenSSL: Use-after-free in X509 object handling
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=20171129,repor...
: Security
Depends On: 1640218 1640219 1642776 1642777 1642778 1642779 1642769
Blocks: 1640222
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Reported: 2018-10-17 10:55 EDT by Andrej Nemec
Modified: 2018-11-01 02:16 EDT (History)
38 users (show)

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Fixed In Version: pyOpenSSL 17.5.0
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pharvey: needinfo? (dmoppert)

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Description Andrej Nemec 2018-10-17 10:55:13 EDT 
Python Cryptographic Authority pyopenssl version before 17.5.0 has a use-after-free vulnerability in X509 object handling. This can result in a denial of service or potentially even code execution

Upstream issue:

https://github.com/pyca/pyopenssl/pull/723
Comment 1 Andrej Nemec 2018-10-17 10:56:17 EDT 
Created pyOpenSSL tracking bugs for this issue:

Affects: fedora-28 [bug 1640218]
Affects: openstack-rdo [bug 1640219]
Comment 9 Doran Moppert 2018-10-25 19:18:19 EDT 
Based on discussions with engineering, and examination of the code we ship that uses pyOpenSSL, the severity of this issue has been downgraded.  This vulnerability is only exposed when a verify callback stores a reference to the x509 object that will outlive the connection, which is a very unusual need for most applications.  We have not observed any code exhibiting this pattern in Red Hat products.
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