Bug 1868032 (CVE-2020-8231) - CVE-2020-8231 curl: Expired pointer dereference via multi API with CURLOPT_CONNECT_ONLY option set
Summary: CVE-2020-8231 curl: Expired pointer dereference via multi API with CURLOPT_CO...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2020-8231
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1869752 1869753 1869754 1870092 1870093 1870614 1870615 1870629
Blocks: 1868033
TreeView+ depends on / blocked
 
Reported: 2020-08-11 13:11 UTC by Pedro Sampaio
Modified: 2023-09-15 00:46 UTC (History)
22 users (show)

Fixed In Version: curl 7.72.0
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in libcurl from versions 7.29.0 through 7.71.1. An application that performs multiple requests with libcurl's multi API, and sets the `CURLOPT_CONNECT_ONLY` option, might experience libcurl using the wrong connection. The highest threat from this vulnerability is to data confidentiality.
Clone Of:
Environment:
Last Closed: 2021-05-18 20:34:28 UTC
Embargoed:

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Description Pedro Sampaio 2020-08-11 13:11:24 UTC 
A flaw was found in libcurl from versions 7.29.0 to and including 7.71.1. An application that performs multiple requests with libcurl's multi API and sets the `CURLOPT_CONNECT_ONLY` option, might in rare circumstances experience that when subsequently using the setup connect-only transfer, libcurl will pick and use the wrong connection.

Introducing commit:

https://github.com/curl/curl/commit/c43127414d

Upstream patch:

https://curl.haxx.se/2020-8231.patch

References:

https://curl.haxx.se/docs/CVE-2020-8231.html
Comment 1 Pedro Sampaio 2020-08-11 13:11:30 UTC 
Acknowledgments:

Name: the Curl project
Upstream: Marc Aldorasi
Comment 3 Marian Rehak 2020-08-19 10:50:49 UTC 
Created curl tracking bugs for this issue:

Affects: fedora-all [bug 1870092]


Created mingw-curl tracking bugs for this issue:

Affects: fedora-all [bug 1870093]
Comment 8 Kamil Dudka 2020-09-03 15:49:38 UTC 
The patch provided by curl upstream applies on curl-7.71.1 whereas RHEL-7 uses curl-7.29.0, which was released in 2013.  10242 commits landed upstream in between the 7.29.0 release and the commit that fixed CVE-2020-8231.  Adapting the fix on a 7 years old code base is a risky task.  Bug #1683292 is a good example of what happens when such a backport goes wrong.  In this case it is also difficult to verify that backported fix actually works.  Is there any reproducer for the security issue in question?
Comment 17 errata-xmlrpc 2021-05-18 13:40:29 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:1610 https://access.redhat.com/errata/RHSA-2021:1610
Comment 18 Product Security DevOps Team 2021-05-18 20:34:28 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2020-8231
Comment 19 Product Security DevOps Team 2021-05-19 02:33:39 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2020-8231
Comment 20 Red Hat Bugzilla 2023-09-15 00:46:17 UTC 
The needinfo request[s] on this closed bug have been removed as they have been unresolved for 500 days
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