Very High
CVE-2023-29357
CVE ID
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CVE-2023-29357
MITRE ATT&CK
Collection
Command and Control
Credential Access
Defense Evasion
Discovery
Execution
Exfiltration
Impact
Initial Access
Lateral Movement
Persistence
Privilege Escalation
Topic Tags
Description
Microsoft SharePoint Server Elevation of Privilege Vulnerability
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Ratings
-
Attacker ValueVery High
-
ExploitabilityHigh
Technical Analysis
CVE-2023-29357 is a critical vulnerability in Microsoft SharePoint Server, classified as an Elevation of Privilege (EoP) flaw. . This vulnerability allows attackers to use spoofed JSON web tokens (JWTs) to gain Administrator privileges on the SharePoint host. The exploit does not require the attacker to have any privileges or for the user to perform any action
The vulnerability was identified by Nguyễn Tiến Giang (Jang) of StarLabs SG and demonstrated at ZDI’s Pwn2Own hacking contest in March 2023. In September 2023, a technical writeup of the flaw and its use in a two-bug exploit chain to achieve pre-authentication remote code execution (RCE) on the SharePoint server was published, along with proof-of-concept (PoC) code demonstrating the attack. Write-up link: https://starlabs.sg/blog/2023/09-sharepoint-pre-auth-rce-chain/
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General Information
Vendors
- microsoft
Products
- sharepoint server 2019
Exploited in the Wild
- Government or Industry Alert (https://www.cisa.gov/known-exploited-vulnerabilities-catalog)
- Other: CISA Gov Alert (https://www.cisa.gov/news-events/alerts/2024/01/10/cisa-adds-one-known-exploited-vulnerability-catalog)
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Exploit
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Additional Info
Technical Analysis
Report as Exploited in the Wild
CVE ID
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