Title: NT RAS Phonebook Buffer Overflow Vulnerability
Severity: HIGH
Description:
Microsoft Windows NT RAS Service contains multiple buffer overflows that allow the execution of arbitrary code resulting in elevated privileges by local users.
The RAS Service allows users to dial and connect to RAS servers, or other dial-up servers. The RAS API function RasGetDialParams performs no bounds checkings which leads to an exploitable buffer overflow. The RAS RASMAN.EXE components implements the RAS Autodial Manager and RAS Connection Manager services which are used to dial out. RASMAN.EXE is a system process and is run in the security context of the LocalSystem account. RASMAN.EXE uses the RasGetDialParams function to read in things such as the telephone number from the Phonebook (rasphone.pbk) when is tries to dial out. This leads to a vulnerability that can be exploited by creating a phonebook entry with executable code inserted in the phone number parameter. If the phone number is over 299 bytes in length the process's saved return address will be overwritten.
Affected Products:
- Microsoft Windows NT 4.0
- Microsoft Windows NT 4.0 SP1
- Microsoft Windows NT 4.0 SP2
- Microsoft Windows NT 4.0 SP3
- Microsoft Windows NT 4.0 SP4
- Microsoft Windows NT 4.0 SP5
- Microsoft Windows NT Enterprise Server 4.0
- Microsoft Windows NT Enterprise Server 4.0 SP1
- Microsoft Windows NT Enterprise Server 4.0 SP2
- Microsoft Windows NT Enterprise Server 4.0 SP3
- Microsoft Windows NT Enterprise Server 4.0 SP4
- Microsoft Windows NT Enterprise Server 4.0 SP5
- Microsoft Windows NT Server 4.0
- Microsoft Windows NT Server 4.0 SP1
- Microsoft Windows NT Server 4.0 SP2
- Microsoft Windows NT Server 4.0 SP3
- Microsoft Windows NT Server 4.0 SP4
- Microsoft Windows NT Server 4.0 SP5
- Microsoft Windows NT Terminal Server 4.0
- Microsoft Windows NT Terminal Server 4.0 SP1
- Microsoft Windows NT Terminal Server 4.0 SP2
- Microsoft Windows NT Terminal Server 4.0 SP3
- Microsoft Windows NT Terminal Server 4.0 SP4
- Microsoft Windows NT Terminal Server 4.0 SP5
- Microsoft Windows NT Workstation 4.0
- Microsoft Windows NT Workstation 4.0 SP1
- Microsoft Windows NT Workstation 4.0 SP2
- Microsoft Windows NT Workstation 4.0 SP3
- Microsoft Windows NT Workstation 4.0 SP4
- Microsoft Windows NT Workstation 4.0 SP5
References:
- Microsoft: Q230677: Malformed Phonebook Entry Security Vulnerability in RAS Client
- Mnemonix <mnemonix@globalnet.co.uk>: Exploiting Windows NT 4 Buffer Overruns, A Case Study: RASMAN.EXE
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