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CVE-2020-1337 PoC — Windows Print Spooler Elevation of Privilege Vulnerability

Source
https://github.com/math1as/CVE-2020-1337-exploit
Associated Vulnerability
Title:Windows Print Spooler Elevation of Privilege Vulnerability (CVE-2020-1337)
Description:An elevation of privilege vulnerability exists when the Windows Print Spooler service improperly allows arbitrary writing to the file system. An attacker who successfully exploited this vulnerability could run arbitrary code with elevated system privileges. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. To exploit this vulnerability, an attacker would have to log on to an affected system and run a specially crafted script or application. The update addresses the vulnerability by correcting how the Windows Print Spooler Component writes to the file system.
Description
CVE-2020-1337 Windows Print Spooler Privilege Escalation
Readme
# CVE-2020-1337 Windows Privilege Escalation
this is a WWW(write-what-where) exploit 

## credit

Junyu Zhou (@md5_salt), who told me there could be a new bug.

Wenxu Wu (@ma7h1as), I find the bug and write this exploit.

## how it works
in the patch of CVE-2020-1048, Microsoft add the validation code of portname on XcvData function.

which could be triggered by call Add-Printer in Powershell.

now both AddPort and XcvData function would check if current user has access to portname.

but still, We could use junction to solve this problem, once the check is passed, we reparse it to a system folder. for example, C:\windows\system32

after reboot or service restart, user controlled data would be written into portname.

see exploit.ps1 for more details.
File Snapshot

 [4.0K]  /data/pocs/d09f84bb7e8c8ce216bd7ffa8b5913b5b3a202a4
├── [169K]  exploit.ps1
└── [ 760]  README.md

0 directories, 2 files
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