A vulnerability was found in InnoSetup Installer (unknown version). It has been declared as problematic. Affected by this vulnerability is an unknown code block. The manipulation with an unknown input leads to a uncontrolled search path vulnerability. The CWE definition for the vulnerability is CWE-427. The product uses a fixed or controlled search path to find resources, but one or more locations in that path can be under the control of unintended actors. As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was disclosed 03/06/2017 by Stefan Kanthak as Executable installers are defective^WEVIL (case 2): innosetup-5.5.9.exe and innosetup-5.5.9-unicode.exe as not defined mailinglist post (Full-Disclosure). The advisory is shared at seclists.org. This vulnerability is known as CVE-2017-20051. The attack can be launched remotely. The requirement for exploitation is a single authentication. Technical details are unknown but a public exploit is available. MITRE ATT&CK project uses the attack technique T1574 for this issue.

A public exploit has been developed by Stefan Kanthak and been published immediately after the advisory. It is possible to download the exploit at seclists.org. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 9 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.

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• Installer

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