Two vulnerabilities have been discovered in FirstClass Client, which can be exploited by malicious people to compromise a user's system.
1) An input sanitation error when processing "FCP://" URL links can be exploited to create an arbitrary file with attacker controlled content via a specially crafted link e.g. sent in an email message.
Successful exploitation of this vulnerability allows execution of arbitrary code, but requires a user to click on a malicious link.
2) The application bundles a vulnerable version of the Pthreads-win32 library, which loads libraries (e.g. quserex.dll) in an insecure manner and can be exploited to load arbitrary libraries by tricking a user into e.g. opening a FC (".fc") file located on a remote WebDAV or SMB share.
The vulnerabilities are confirmed in version 11.005. Other versions may also be affected.
Solution: Do not open links and files from untrusted users.
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Subject: FirstClass Client Link Input Sanitation and Insecure Library Loading Vulnerabilities
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