Bug 1640217 (CVE-2018-1000807) - CVE-2018-1000807 pyOpenSSL: Use-after-free in X509 object handling
Summary: CVE-2018-1000807 pyOpenSSL: Use-after-free in X509 object handling
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2018-1000807
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1640218 1640219 1642769 1642776 1642777 1642778 1642779 1649621 1654552
Blocks: 1640222
TreeView+ depends on / blocked
 
Reported: 2018-10-17 14:55 UTC by Andrej Nemec
Modified: 2022-07-24 14:56 UTC (History)
38 users (show)

Fixed In Version: pyOpenSSL 17.5.0
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2019-06-10 10:39:56 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2019:0085 0 None None None 2019-01-16 17:53:26 UTC

Internal Links: 1666967

Description Andrej Nemec 2018-10-17 14:55:13 UTC 
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 14:56:17 UTC 
Created pyOpenSSL tracking bugs for this issue:

Affects: fedora-28 [bug 1640218]
Affects: openstack-rdo [bug 1640219]
Comment 9 Doran Moppert 2018-10-25 23:18:19 UTC 
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.
Comment 18 errata-xmlrpc 2019-01-16 17:53:23 UTC 
This issue has been addressed in the following products:

  Red Hat OpenStack Platform 13.0 (Queens)

Via RHSA-2019:0085 https://access.redhat.com/errata/RHSA-2019:0085
Comment 19 Doran Moppert 2020-07-03 01:33:47 UTC 
Statement:

This vulnerability is only present when a specific and uncommon usage pattern of pyOpenSSL occurs. Red Hat Product Security has audited our packages that use pyOpenSSL, and determined that software we distribute in Red Hat Enterprise Linux and Red Hat Virtualization does not use pyOpenSSL in such a way as to be vulnerable. Future updates may address this issue.
Note You need to log in before you can comment on or make changes to this bug.