Bug 1302263 (CVE-2016-0755) - CVE-2016-0755 curl: NTLM credentials not-checked for proxy connection re-use
Summary: CVE-2016-0755 curl: NTLM credentials not-checked for proxy connection re-use
Keywords:
Status: CLOSED WONTFIX
Alias: CVE-2016-0755
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: impact=low,public=20160127,reported=2...
Depends On: 1302264 1302265 1302266
Blocks: 1302268
TreeView+ depends on / blocked
 
Reported: 2016-01-27 10:38 UTC by Andrej Nemec
Modified: 2019-06-08 20:58 UTC (History)
17 users (show)

Fixed In Version: libcurl 7.47.0
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2016-05-16 21:26:28 UTC


Attachments (Terms of Use)

Description Andrej Nemec 2016-01-27 10:38:03 UTC
A vulnerability was found in a way libcurl uses NTLM-authenticated proxy connections.
Libcurl will reuse NTLM-authenticated proxy connections without properly making sure,
that the connection was authenticated with the same credentials as set for this transfer.

Upstream bug report:

http://curl.haxx.se/docs/adv_20160127A.html

Upstream patch:

http://curl.haxx.se/CVE-2016-0755.patch

Acknowledgements:

Red Hat would like to thank curl upstream for reporting this issue. Upstream acknowledges Isaac Boukris as the original reporter.

Comment 1 Andrej Nemec 2016-01-27 10:38:41 UTC
Created curl tracking bugs for this issue:

Affects: fedora-all [bug 1302265]

Comment 2 Andrej Nemec 2016-01-27 10:38:49 UTC
Created mingw-curl tracking bugs for this issue:

Affects: fedora-all [bug 1302264]
Affects: epel-7 [bug 1302266]

Comment 3 Fedora Update System 2016-01-30 18:20:12 UTC
curl-7.43.0-5.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.

Comment 4 Fedora Update System 2016-02-02 00:51:26 UTC
curl-7.40.0-8.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.

Comment 6 Tomas Hoger 2016-05-16 21:26:28 UTC
This issue affects use cases when curl uses HTTP proxy with NTLM authentication, and switches to different proxy or different proxy authentication credentials between requests.  Later requests may unexpectedly re-use authenticated proxy connections from earlier requests.

Due to this issue being limited to very specific circumstances, there is currently no plan to backport the fix to released Red Hat Enterprise Linux versions.


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