OSU Open Source Lab VNCAuthProxy through 1.1.1 is affected by an vncap/vnc/protocol.py VNCServerAuthenticator authentication-bypass vulnerability that could allow a malicious actor to gain unauthorized access to a VNC session or to disconnect a legitimate user from a VNC session. A remote attacker with network access to the proxy server could leverage this vulnerability to connect to VNC servers protected by the proxy server without providing any authentication credentials. Exploitation of this issue requires that the proxy server is currently accepting connections for the target VNC server.

Threat-Mapped Scoring

Score: 3.25

Priority: P2 - Serious (High)

• S1 – Steal Customer Account Information
• S9 – Sabotage of System/App (+0.25 bonus)

EPSS

Score: 0.00138
Percentile: 0.34532

CVSS Scoring

Mapped CWE(s)

• CWE-287 : Improper Authentication

All CAPEC(s)

CAPEC(s) with Mapped TTPs

Mapped ATT&CK TTPs

• T1548 : Abuse Elevation Control Mechanism
  Kill Chain: privilege-escalation
• T1548 : Abuse Elevation Control Mechanism
  Kill Chain: privilege-escalation
• T1040 : Network Sniffing
  Kill Chain: credential-access
• T1185 : Browser Session Hijacking
  Kill Chain: collection
• T1550.001 : Application Access Token
  Kill Chain: defense-evasion
• T1563 : Remote Service Session Hijacking
  Kill Chain: lateral-movement
• T1134 : Access Token Manipulation
  Kill Chain: defense-evasion
• T1505.003 : Web Shell
  Kill Chain: persistence
• T1557 : Adversary-in-the-Middle
  Kill Chain: credential-access

Malware

APTs Threat Group Associations

Campaigns

Affected Products

• cpe:2.3:a:osuosl:twisted_vnc_authentication_proxy:*:*:*:*:*:*:*:*

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