Unknown
CVE-2021-34484
CVE ID
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CVE-2021-34484
MITRE ATT&CK
Collection
Command and Control
Credential Access
Defense Evasion
Discovery
Execution
Exfiltration
Impact
Initial Access
Lateral Movement
Persistence
Privilege Escalation
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Technical Analysis
This bug was evidently used by LAPSUS$ in the wild as part of the attack on Okta.
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Appears there may have been some confusion here. As noted at https://twitter.com/wdormann/status/1508555477491269638 and at https://twitter.com/BillDemirkapi/status/1508527487655067660/photo/1, the attackers tried to download UserProfileSvcEoP.exe
from https://github.com/klinix5/ProfSvcLPE/blob/main/DoubleJunctionEoP/Release/UserProfileSvcEoP.exe. If you look at https://github.com/klinix5/ProfSvcLPE/blob/main/write-up.docx you can see this is actually a patch bypass for CVE-2021-34484, and was later fixed by CVE-2022-21919.
Ironically enough this later got another patch bypass in the form of CVE-2022-26904 which at the time of writing is still unpatched.
All of these vulnerabilities exploit a logic flaw whereby the User Profile Service had a CreateDirectoryJunction()
function that did not appropriately validate its input to ensure it wasn’t using symbolic links along any point of the path prior to creating a directory junction between two directories. This could be abused by attackers manipulating paths along the file path to gain code execution as the SYSTEM user by planting a DLL in a sensitive location which would then be loaded by a privileged process.
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General Information
Vendors
- Microsoft
Products
- Windows,
- Windows Server,
- Windows 10 Version 1909 for 32-bit Systems,
- Windows 10 Version 1909 for x64-based Systems,
- Windows 10 Version 1909 for ARM64-based Systems,
- Windows 10 Version 21H1 for x64-based Systems,
- Windows 10 Version 21H1 for ARM64-based Systems,
- Windows 10 Version 21H1 for 32-bit Systems,
- Windows 10 Version 2004 for 32-bit Systems,
- Windows 10 Version 2004 for ARM64-based Systems,
- Windows 10 Version 2004 for x64-based Systems,
- Windows Server, version 2004 (Server Core installation),
- Windows 10 Version 20H2 for x64-based Systems,
- Windows 10 Version 20H2 for 32-bit Systems,
- Windows 10 Version 20H2 for ARM64-based Systems,
- Windows Server, version 20H2 (Server Core Installation)
Exploited in the Wild
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Additional Info
Technical Analysis
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CVE ID
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