WindScribe up to 1.81 VPN WindScribeService.exe lpCommandLine input validation

Summaryinfo

A vulnerability was found in WindScribe up to 1.81 and classified as critical. This impacts an unknown function of the file WindScribeService.exe of the component VPN. The manipulation of the argument lpCommandLine as part of Named Pipe results in input validation. This vulnerability was named CVE-2018-11479. The attack needs to be approached locally. In addition, an exploit is available.

Detailsinfo

A vulnerability was found in WindScribe up to 1.81. It has been classified as critical. Affected is an unknown code of the file WindScribeService.exe of the component VPN. The manipulation of the argument lpCommandLine as part of a Named Pipe leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

The VPN component in Windscribe 1.81 uses the OpenVPN client for connections. Also, it creates a WindScribeService.exe system process that establishes a \\.\pipe\WindscribeService named pipe endpoint that allows the Windscribe VPN process to connect and execute an OpenVPN process or other processes (like taskkill, etc.). There is no validation of the program name before constructing the lpCommandLine argument for a CreateProcess call. An attacker can run any malicious process with SYSTEM privileges through this named pipe.

The bug was discovered 05/24/2018. The weakness was presented 05/25/2018 (Website). The advisory is shared for download at sqlulz.blogspot.com. This vulnerability is traded as CVE-2018-11479 since 05/25/2018. The attack needs to be approached locally. A authentication is needed for exploitation. Technical details and a public exploit are known.

The exploit is shared for download at packetstormsecurity.com. It is declared as highly functional. The vulnerability was handled as a non-public zero-day exploit for at least 1 days. During that time the estimated underground price was around $0-$5k.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Exploit-DB (48021). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Name

• WindScribe

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17
• 1.18
• 1.19
• 1.20
• 1.21
• 1.22
• 1.23
• 1.24
• 1.25
• 1.26
• 1.27
• 1.28
• 1.29
• 1.30
• 1.31
• 1.32
• 1.33
• 1.34
• 1.35
• 1.36
• 1.37
• 1.38
• 1.39
• 1.40
• 1.41
• 1.42
• 1.43
• 1.44
• 1.45
• 1.46
• 1.47
• 1.48
• 1.49
• 1.50
• 1.51
• 1.52
• 1.53
• 1.54
• 1.55
• 1.56
• 1.57
• 1.58
• 1.59
• 1.60
• 1.61
• 1.62
• 1.63
• 1.64
• 1.65
• 1.66
• 1.67
• 1.68
• 1.69
• 1.70
• 1.71
• 1.72
• 1.73
• 1.74
• 1.75
• 1.76
• 1.77
• 1.78
• 1.79
• 1.80
• 1.81

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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