CVE-2017-7393: Double Free
First published: Sat Apr 01 2017(Updated: )
In TigerVNC (VNCSConnectionST.cxx VNCSConnectionST::fence), an authenticated client can cause a double free, leading to a crash of the TigerVNC server. Upstream patch: <a href="https://github.com/TigerVNC/tigervnc/pull/438/commits/f3afa24da144409a3c3a0e35913112583d987671">https://github.com/TigerVNC/tigervnc/pull/438/commits/f3afa24da144409a3c3a0e35913112583d987671</a> Upstream bug: <a href="https://github.com/TigerVNC/tigervnc/issues/437">https://github.com/TigerVNC/tigervnc/issues/437</a>
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Tigervnc | =1.7.1 |
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Reference Links
- http://www.securityfocus.com/bid/97305
- https://access.redhat.com/errata/RHSA-2017:2000
- https://github.com/TigerVNC/tigervnc/pull/438
- https://security.gentoo.org/glsa/201801-13
- https://github.com/TigerVNC/tigervnc/pull/438/commits/f3afa24da144409a3c3a0e35913112583d987671
- https://github.com/TigerVNC/tigervnc/issues/437
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1438704
- https://bugzilla.redhat.com/show_bug.cgi?id=1438697
Frequently Asked Questions
What is the severity of CVE-2017-7393?
CVE-2017-7393 is considered a medium severity vulnerability as it allows an authenticated client to cause a crash of the TigerVNC server.
How do I fix CVE-2017-7393?
To fix CVE-2017-7393, users should upgrade to the latest version of TigerVNC that contains the patch addressing this vulnerability.
Who is affected by CVE-2017-7393?
CVE-2017-7393 affects users running TigerVNC version 1.7.1.
What can attackers do with CVE-2017-7393?
Attackers exploiting CVE-2017-7393 can cause a denial of service by triggering a double free condition that crashes the TigerVNC server.
Is CVE-2017-7393 related to authentication?
Yes, CVE-2017-7393 requires authentication, allowing only authenticated clients to exploit the vulnerability.
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