The IsDriveLetterAvailable method in Driver/Ntdriver.c in TrueCrypt 7.0, VeraCrypt before 1.15, and CipherShed, when running on Windows, does not properly validate drive letter symbolic links, which allows local users to mount an encrypted volume over an existing drive letter and gain privileges via an entry in the /GLOBAL?? directory.
Weaknesses in this category are related to the management of permissions, privileges, and other security features that are used to perform access control.
Link | Tags |
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https://veracrypt.codeplex.com/wikipage?title=Release%20Notes | release notes vendor advisory |
https://www.exploit-db.com/exploits/38403/ | exploit vdb entry third party advisory |
http://www.openwall.com/lists/oss-security/2015/09/24/3 | issue tracking mailing list third party advisory |
http://packetstormsecurity.com/files/133878/Truecrypt-7-Derived-Code-Windows-Drive-Letter-Symbolic-Link-Creation-Privilege-Escalation.html | vdb entry third party advisory |
http://www.openwall.com/lists/oss-security/2015/09/22/7 | third party advisory mailing list |
https://code.google.com/p/google-security-research/issues/detail?id=538 | third party advisory |