VNC: LibVNCServer LibVNCClient FramebufferUpdate Rectangle Heap Buffer Overflow
A heap-based buffer overflow has been reported in LibVNCServer LibVNCClient. The vulnerability is due to improper handling of FramebufferUpdate messages with specially crafted rectangles. A remote attacker could exploit this vulnerability by enticing a user to connect to a malicious VNC server and sending a crafted FramebufferUpdate message to a vulnerable target client. Successful exploitation of this vulnerability could result in arbitrary code execution within the context of the application.
Extended Description
Heap-based buffer overflow in rfbproto.c in LibVNCClient in LibVNCServer before 0.9.11 allows remote servers to cause a denial of service (application crash) or possibly execute arbitrary code via a crafted FramebufferUpdate message containing a subrectangle outside of the client drawing area.
Affected Products
Libvncserver_project libvncserver
Short Name
VNC:LIBVNCSERVER-BOF
Severity
Major
Recommended
False
Recommended Action
Drop
Category
VNC
Keywords
Buffer CVE-2016-9941 FramebufferUpdate Heap LibVNCClient LibVNCServer Overflow Rectangle bid:95170
Release Date
01/30/2017
Supported Platforms
srx-branch-12.3
srx-19.3
srx-branch-19.3
vsrx3bsd-19.2
srx-branch-19.4
vsrx-19.4
mx-12.3
mx-19.4
vmx-19.4
mx-19.3
vsrx3bsd-19.4
srx-19.4
vsrx-12.3
vmx-19.3
vsrx-19.2
srx-12.3
Sigpack Version
3337
False Positive
Unknown
Vendors
Libvncserver_project
CVSS Score
7.5