Signature Detail
Short Name |
VNC:ERR:CONFLICT-HEXTILE-MASK |
|---|---|
Severity |
Low |
Recommended |
No |
Category |
VNC |
Release Date |
2003/04/22 |
Update Number |
1213 |
Supported Platforms |
idp-4.0+, isg-3.0+, j-series-9.5+, mx-9.4+, srx-9.2+, srx-branch-9.4+, vsrx-12.1+ |
VNC: Conflicting Hextile Mask
This protocol anomaly is a VNC FrameBufferUpdate message that has a conflicting hextile encoding bitmask. The VNC protocol specifies that hextile encoded messages that set the ForegroundSpecified bit to ON must set the SubrectsColoured bit to OFF.
Extended Description
RFB datagrams containing FOREGROUND_SPECIFIED and SUBRECTSCOLORED bits that are both ON or both OFF constitute an RFB protocol violation and could produce unexpected results on the VNC client. The error may be a result of a network transmission problem or a malicious session-hijacking attempt by a third party.
References