Bug 1438700 (CVE-2017-7394) - CVE-2017-7394 tigervnc: Server crash via long usernames
Summary: CVE-2017-7394 tigervnc: Server crash via long usernames
Status: CLOSED ERRATA
Alias: CVE-2017-7394
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: impact=moderate,public=20170329,repor...
Keywords: Security
Depends On: 1438704 1438737
Blocks: 1415638 1438705
TreeView+ depends on / blocked
 
Reported: 2017-04-04 08:45 UTC by Andrej Nemec
Modified: 2019-06-11 11:13 UTC (History)
4 users (show)

(edit)
A missing input sanitization flaw was found in the way TigerVNC handled credentials. A remote unauthenticated attacker could use this flaw to make Xvnc crash by sending specially crafted usernames, resulting in denial of service.
Clone Of:
(edit)
Last Closed: 2019-06-08 03:09:52 UTC


Attachments (Terms of Use)


External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2017:2000 normal SHIPPED_LIVE Moderate: tigervnc and fltk security, bug fix, and enhancement update 2017-08-01 18:33:08 UTC

Description Andrej Nemec 2017-04-04 08:45:51 UTC
In TigerVNC (SSecurityPlain.cxx SSecurityPlain::processMsg), unauthenticated users can crash the server by sending long usernames. 

Upstream patches:

https://github.com/TigerVNC/tigervnc/pull/440/commits/62197c89e98be47a174074e4c7429c57767a4929
https://github.com/TigerVNC/tigervnc/pull/440/commits/9801c5efcf8c1774d9c807ebd5d27ac7049ad993

Comment 1 Andrej Nemec 2017-04-04 08:54:30 UTC
Created tigervnc tracking bugs for this issue:

Affects: fedora-all [bug 1438704]

Comment 4 errata-xmlrpc 2017-08-01 20:51:50 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:2000 https://access.redhat.com/errata/RHSA-2017:2000


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