Bug 1277337 - (CVE-2015-4515) CVE-2015-4515 Mozilla: Information disclosure through NTLM authentication (MFSA 2015-117)
CVE-2015-4515 Mozilla: Information disclosure through NTLM authentication (MF...
Status: CLOSED NOTABUG
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=20151104,repor...
: Security
Depends On:
Blocks: 1275590
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Reported: 2015-11-03 00:42 EST by Huzaifa S. Sidhpurwala
Modified: 2015-11-03 23:57 EST (History)
1 user (show)

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Doc Type: Bug Fix
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Last Closed: 2015-11-03 23:57:11 EST
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Description Huzaifa S. Sidhpurwala 2015-11-03 00:42:05 EST
Security researcher Tim Brown reported that Firefox discloses the hostname and possibly the Windows domain through NTLM-based HTTP authentication when sending type 3 messages as part of the authentication exchange. This is because the Workstation field is populated with the hostname of the system making the request. An attacker can craft a malicious page to send a silent NTLM request that will disclose the information without visibility in the client, leading to information disclosure. This is mitigated because NTLM v1 is disabled by default configurations. 


External Reference:

https://www.mozilla.org/security/announce/2015/mfsa2015-117.html


Acknowledgements:

Red Hat would like to thank the Mozilla project for reporting this issue. Upstream acknowledges Tim Brown  as the original reporter.

Statement:

This issue does not affect the version of firefox and thunderbird as shipped with Red Hat Enterprise Linux 5, 6 and 7.

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