VAR-200210-0278

Vulnerability from variot - Updated: 2025-04-03 22:14

Cisco Virtual Private Network (VPN) Client software 2.x.x, and 3.x before 3.5.2B, does not generate sufficiently random numbers, which may make it vulnerable to certain attacks such as spoofing. Cisco has reported that random number generation has been improved in Cisco VPN Client. Weak random number generation may present a security vulnerability to users of the client software, as it may be possible under some circumstances for attackers to anticipate numbers that are generated by the software. If an attacker can anticipate TCP sequence numbers for VPN sessions, it may be possible to mount man-in-the-middle attacks against a connection or possible inject packets into a connection. The attacker may need to be within the VPN to exploit this issue. It can be used under the Microsoft Windows operating system, and can also be used under the Linux operating system. A remote attacker can exploit this vulnerability to attack via the Man-In-Middle method or insert packets into an existing connection. Or remote unauthorized access to the VPN concentrator. CISCO designated this vulnerability number as: CSCdx89416

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