Bug 1302263 (CVE-2016-0755)

Summary: CVE-2016-0755 curl: NTLM credentials not-checked for proxy connection re-use
Product: [Other] Security Response Reporter: Andrej Nemec <anemec>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED WONTFIX QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: bgollahe, csutherl, dknox, erik-fedora, jclere, jdoyle, jorton, kanderso, kdudka, lgao, mbabacek, mmaslano, myarboro, paul, slawomir, twalsh, weli
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: libcurl 7.47.0 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2016-05-16 21:26:28 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 1302264, 1302265, 1302266    
Bug Blocks: 1302268    

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 5 Tomas Hoger 2016-05-16 20:14:02 UTC 
Upstream commit:

https://github.com/curl/curl/commit/d41dcba4e9b69d6b761e3460cc6ae7e8fd8f621f
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.