UltraVNC Viewer VNC client RFB rfbServerInitMsg Heap Overflow Vulnerability
2021-12-17 05:55:02 Author: blog.exodusintel.com(查看原文) 阅读量:17 收藏


A vulnerability exists within UltraVNC’s “vncviewer.exe” client. Specifically a malicious server may write arbitrary data to arbitrary memory locations through the  in the “rfbServerInitMsg” function upon parsing a long ‘nameLength’ field returned from a nefarious server. An attacker can leverage this in conjunction with other vulnerabilities to execute code in the context of the UltraVNC Viewer process.

Vulnerability Identifiers

  • Exodus Intelligence: EIP-0e1ca3ec

Vulnerability Metrics

  • CVSSv2 Score: 5.8

Vendor References

Discovery Credit

  • Exodus Intelligence

Disclosure Timeline

  • Disclosed to affected vendor: December 8th, 2021
  • Disclosed to public: December 16th, 2021

Further Information

Readers of this advisory who are interested in receiving further details around the vulnerability, mitigations, detection guidance, and more can contact us at [email protected].

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文章来源: https://blog.exodusintel.com/2021/12/16/ultravnc-viewer-vnc-client-rfb-rfbserverinitmsg-heap-overflow-vulnerability/?utm_source=rss&utm_medium=rss&utm_campaign=ultravnc-viewer-vnc-client-rfb-rfbserverinitmsg-heap-overflow-vulnerability