CVE-2023-29357 Detection: Microsoft SharePoint Server Elevation of Privilege Vulnerability Exploitation Can Result in Pre-Auth RCE Chain – Supply:

Risk actors continuously set eyes on Microsoft SharePoint Server merchandise by weaponizing a set of RCE vulnerabilities, akin to CVE-2022-29108 and CVE-2022-26923. Within the early summer time of 2023, Microsoft issued a patch for the newly found SharePoint Server elevation of privilege vulnerability often known as CVE-2023-29357 and thought of important. With the CVE-2023-29357 PoC exploit just lately launched, attackers can achieve administrator-level privileges with out prior authentication within the compromised SharePoint Server cases. Chaining CVE-2023-29357 with one other vulnerability tracked as CVE-2023-24955 can pose an much more critical risk to compromised customers enabling attackers to realize pre-auth RCE on the focused system.

Detect CVE-2023-29357 Exploitation Makes an attempt

Proactive detection of vulnerability exploitation stays one of many high cybersecurity use circumstances on account of a continually escalating variety of CVEs inside fashionable software program options. Weaponized for in-the-wild assaults, vulnerabilities pose a major menace for cyber defenders, exposing organizational infrastructure to the danger of a knowledge breach. To speed up SOC effectivity and assist safety groups tackle current flaws on time, SOC Prime offers a set of superior instruments aimed toward attempting to find vulnerability exploitation together with curated detection content material to detect rising threats on time.

With the escalating risk of potential exploitation of CVE-2023-29357 within the wild, cyber defenders are trying to find methods to defend their SharePoint Server cases in opposition to malicious intrusions. The SOC Prime Group just lately launched a novel Sigma rule primarily based on the publicly obtainable PoC exploit code. The detection algorithm identifies potential CVE-2023-29357 exploitation makes an attempt, which can be a part of the pre-auth SharePoint Server RCE chain. Observe the hyperlink beneath to immediately entry the related detection obtainable within the Risk Detection Market in depth rule feed:

Possible CVE-2023-29357 (Microsoft SharePoint Server Elevation of Privilege) Exploitation Attempt (via proxy)

This Sigma rule can be utilized throughout 18 cloud-native and on-prem safety options and is aligned with the MITER ATT&CK® framework v12 addressing the Lateral Motion tactic together with the Exploitation of Distant Providers approach (T1210).

Safety engineers may reap the benefits of the next Sigma guidelines to detect extra threats that may compromise the SharePoint Server units and guarantee their system is totally protected in opposition to adversary intrusions. Press the Discover Detections button to drill all the way down to the record of related Sigma guidelines and CTI linked to them.

Explore Detections

CVE-2023-29357 Evaluation

In mid-June 2023, Microsoft issued a patch to handle a important CVE-2023-29357 vulnerability in Microsoft SharePoint Server, possessing a CVSS rating of 9.8. As soon as exploited, this safety flaw allows adversaries to acquire administrator-level privileges with out the necessity for prior authentication. The exploitation makes an attempt of this elevation of privilege vulnerability enable mimicking JWT authentication tokens to additional launch a community assault, bypass authentication procedures, and achieve entry to the privileges of an authenticated consumer.

With PoC exploit code just lately published on GitHubCVE-2023-29357 is moving into the limelight within the cyber risk area. Whereas the exploit script is primarily targeted on the elevation of privilege, adversaries may reap the benefits of one other SharePoint Server flaw often known as CVE-2023–24955resulting in an RCE exploit chain and in consequence, a full system compromise. From a broader perspective, the GitHub exploit script allows the impersonation of authenticated customers permitting attackers to run arbitrary code disguised because the SharePoint utility, probably resulting in a DoS assault. As well as, the PoC exploit code reveals admin customers with elevated privileges, with the flexibility to function in each single and mass exploit modes.

A cybersecurity researcher from StarLabs, Nguyễn Tiến Giang, supplied an in-depth analysis of a fancy pre-authentication exploit chain designed to focus on SharePoint Server merchandise involving the 2 above-mentioned RCE safety flaws. In line with his analysis, the important thing problem lies in utilizing the authentication bypass vulnerability to entry solely the SharePoint API after which figuring out a post-auth RCE chain by way of this API.

The CVE-2023-29357 flaw primarily impacts the SharePoint Server 2019 software program model, which requires fast consideration from organizations and particular person customers leveraging related cases to forestall the potential compromise. To mitigate the risk, Microsoft recommends the set up of all safety updates related to the 2019 software program model in use. Along with patching, one other mitigation measure might be enabling the AMSI integration performance and leveraging Microsoft Defender throughout SharePoint Server cases.

The general public availability of the  CVE-2023-29357 PoC exploit can result in the rising dangers of vulnerability exploitation within the wild. Depend on SOC Prime to be the primary to know in regards to the newest CVEs, discover tailor-made intelligence, and your entire assortment of relevant Sigma rules.

Date: 2023-09-27 12:46:08

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Alina A, Toronto
Alina A, Toronto
Alina A, an UofT graduate & Google Certified Cyber Security analyst, currently based in Toronto, Canada. She is passionate for Research and to write about Cyber-security related issues, trends and concerns in an emerging digital world.


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