Very High
CVE-2020-1337
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.
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Technical Analysis
CVE-2020-1337 is a bypass of (PrintDemon) CVE-2020-1048’s patch via a Junction Directory, made to remediate an Elevation of Privileges (EoP)\Local Privilege Escalation (LPE) vulnerability affecting the Windows’ Print Spooler Service. The vulnerability does require low privilege access and for the spooler service to restart.
The patch appeared in Microsoft’s patch Tuesday (11th August 2020) – https://portal.msrc.microsoft.com/en-us/security-guidance/advisory/CVE-2020-1337#ID0EWIAC.
Vulnerability description, root cause analysis and PoC code on https://voidsec.com/cve-2020-1337-printdemon-is-dead-long-live-printdemon/
Technical Analysis
This is a print spooler vulnerability similar to CVE-2020-1048, but it uses a specially-crafted *.SHD to trigger a print to a trusted location. Introduced at Blackhat on August 6, 2020, a patch is expected to appear next week in Microsoft’s patch Tuesday.
The vulnerability does require low privilege access and for the spooler service to restart.
PoC will be uploaded to https://github.com/SafeBreach-Labs/spooler on August 12.
This is extremely valuable to attackers. The exploit is most likely present on all versions of Windows from Windows 7 to present and the race is now on to patch it while PoCs are already in the wild.
CVSS V3 Severity and Metrics
General Information
Vendors
- microsoft
Products
- windows 10 -,
- windows 10 1607,
- windows 10 1709,
- windows 10 1803,
- windows 10 1809,
- windows 10 1903,
- windows 10 1909,
- windows 10 2004,
- windows 7 sp1,
- windows 8.1 -,
- windows rt 8.1 -,
- windows server 2008 -,
- windows server 2008 r2,
- windows server 2012 -,
- windows server 2012 r2,
- windows server 2016 -,
- windows server 2016 1903,
- windows server 2016 1909,
- windows server 2016 2004,
- windows server 2019 -
Metasploit Modules
References
