RealVNC RFB protocol code execution

realvnc-rfb-protocol-code-execution (47937) The risk level is classified as HighHigh Risk

Description:

RealVNC could allow a remote attacker to execute arbitrary code on the system, caused by an error in the validation of server-supplied RFB protocol data. A remote attacker could exploit this vulnerability to execute arbitrary code on the system with the privileges of the victim and cause the viewer to crash.

*CVSS:

Base Score: 7.5
  Access Vector: Network
  Access Complexity: Low
  Authentication: None
  Confidentiality Impact: Partial
  Integrity Impact: Partial
  Availability Impact: Partial
 
Temporal Score: 5.5
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Gain Access

Remedy:

Upgrade to the latest version of RealVNC or RealVNC Free (4.1.3 or later), available from the RealVNC Web site. See References.

For Solaris:
Refer to Sun Alert ID: 248526 for patch, upgrade or suggested workaround information. See References.

For other distributions:
Apply the appropriate update for your system. See References.

References:

  • NORTEL BULLETIN ID: 2009009313, Rev 1: Nortel Response to Sun Alert 248526 - Solaris vncviewer(1) RFB Protocol Validation.
  • RealVNC Web site: RealVNC - RealVNC remote control software.
  • Sun Alert ID: 248526: A Security Vulnerability in the vncviewer(1) RFB Protocol Validation May Allow Execution of Arbitrary Code and Lead to a Denial of Service (DoS) .
  • VNC-List Mailing List: VNC Viewer Vulnerability CVE-2008-4770 .
  • ASA-2009-029: A Security Vulnerability in the vncviewer(1) RFB Protocol Validation May Allow Execution of Arbitrary Code and Lead to a Denial of Service (DoS) (Sun 248526)
  • ASA-2009-062: vnc security update (RHSA-2009-0261)
  • BID-31832: RealVNC 4.1.2 'CMsgReader::readRect()' Remote Code Execution Vulnerability
  • BID-33263: RealVNC 4.1.2 'vncviewer.exe' RFB Protocol Remote Code Execution Vulnerability
  • CVE-2008-4770: The CMsgReader::readRect function in the VNC Viewer component in RealVNC VNC Free Edition 4.0 through 4.1.2, Enterprise Edition E4.0 through E4.4.2, and Personal Edition P4.0 through P4.4.2 allows remote VNC servers to execute arbitrary code via crafted RFB protocol data, related to encoding type.
  • DSA-1716: vnc4 -- integer overflow
  • GLSA-200903-17: Real VNC: User-assisted execution of arbitrary code
  • RHSA-2009-0261: Moderate: vnc security update
  • SA32317: RealVNC VNC Viewer "CMsgReader::readRect()" Encoding Type Vulnerability
  • SA33068: Sun Solaris VNCViewer Vulnerability

Platforms Affected:

  • Debian Debian Linux 4.0
  • Gentoo Linux
  • RealVNC RealVNC 4.1.2 Free
  • RealVNC RealVNC 4.1.2.0
  • RedHat Enterprise Linux 3 ES
  • RedHat Enterprise Linux 3 AS
  • RedHat Enterprise Linux 3 Desktop
  • RedHat Enterprise Linux 3 WS
  • RedHat Enterprise Linux 4 WS
  • RedHat Enterprise Linux 4 Desktop
  • RedHat Enterprise Linux 4 AS
  • RedHat Enterprise Linux 4 ES
  • RedHat Enterprise Linux 4.7.z AS
  • RedHat Enterprise Linux 5 Client
  • RedHat Enterprise Linux 5
  • RedHat Enterprise Linux 5.3.z EUS
  • RedHat Enterprise Linux Long Life 5.3
  • RedHat Red Hat Enterprise Linux 4.7.z ES
  • Sun OpenSolaris build_snv_100 SPARC
  • Sun OpenSolaris build_snv_100 x86
  • Sun OpenSolaris build_snv_101 SPARC
  • Sun OpenSolaris build_snv_101 x86
  • Sun OpenSolaris build_snv_102 SPARC
  • Sun OpenSolaris build_snv_102 x86
  • Sun OpenSolaris build_snv_104 SPARC
  • Sun OpenSolaris build_snv_104 x86
  • Sun OpenSolaris build_snv_74 SPARC
  • Sun OpenSolaris build_snv_74 x86
  • Sun OpenSolaris build_snv_75 SPARC
  • Sun OpenSolaris build_snv_75 x86
  • Sun OpenSolaris build_snv_76 x86
  • Sun OpenSolaris build_snv_76 SPARC
  • Sun OpenSolaris build_snv_77 x86
  • Sun OpenSolaris build_snv_77 SPARC
  • Sun OpenSolaris build_snv_78 x86
  • Sun OpenSolaris build_snv_78 SPARC
  • Sun OpenSolaris build_snv_79 x86
  • Sun OpenSolaris build_snv_79 SPARC
  • Sun OpenSolaris build_snv_80 x86
  • Sun OpenSolaris build_snv_80 SPARC
  • Sun OpenSolaris build_snv_81 x86
  • Sun OpenSolaris build_snv_81 SPARC
  • Sun OpenSolaris build_snv_82 SPARC
  • Sun OpenSolaris build_snv_82 x86
  • Sun OpenSolaris build_snv_83 SPARC
  • Sun OpenSolaris build_snv_83 x86
  • Sun OpenSolaris build_snv_84 SPARC
  • Sun OpenSolaris build_snv_84 x86
  • Sun OpenSolaris build_snv_85 SPARC
  • Sun OpenSolaris build_snv_85 x86
  • Sun OpenSolaris build_snv_86 SPARC
  • Sun OpenSolaris build_snv_86 x86
  • Sun OpenSolaris build_snv_87 x86
  • Sun OpenSolaris build_snv_87 SPARC
  • Sun OpenSolaris build_snv_88 SPARC
  • Sun OpenSolaris build_snv_89 SPARC
  • Sun OpenSolaris build_snv_89 x86
  • Sun OpenSolaris build_snv_90 x86
  • Sun OpenSolaris build_snv_90 SPARC
  • Sun OpenSolaris build_snv_91 x86
  • Sun OpenSolaris build_snv_91 SPARC
  • Sun OpenSolaris build_snv_92 x86
  • Sun OpenSolaris build_snv_92 SPARC
  • Sun OpenSolaris build_snv_93 x86
  • Sun OpenSolaris build_snv_93 SPARC
  • Sun OpenSolaris build_snv_94 x86
  • Sun OpenSolaris build_snv_94 SPARC
  • Sun OpenSolaris build_snv_95 SPARC
  • Sun OpenSolaris build_snv_95 x86
  • Sun OpenSolaris build_snv_96 x86
  • Sun OpenSolaris build_snv_96 SPARC
  • Sun OpenSolaris build_snv_97 x86
  • Sun OpenSolaris build_snv_97 SPARC
  • Sun OpenSolaris build_snv_98 x86
  • Sun OpenSolaris build_snv_98 SPARC
  • Sun OpenSolaris build_snv_99 SPARC
  • Sun OpenSolaris build_snv_99 x86
  • Sun Solaris 10 SPARC
  • Sun Solaris 10 x86

Reported:

Jan 12, 2009

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