Multiple vulnerabilities in Microsoft SharePoint

Published: 2018-12-11 20:34:32
Severity High
Patch available YES
Number of vulnerabilities 2
CVE ID CVE-2018-8635
CVE-2018-8580
CVSSv3 8.6 [CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]
4.7 [CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]
CWE ID CWE-264
CWE-352
Exploitation vector Network
Public exploit N/A
Vulnerable software Microsoft SharePoint Server
Vulnerable software versions Microsoft SharePoint Server 2010
Microsoft SharePoint Server 2013
Microsoft SharePoint Server 2016
Vendor URL Microsoft

Security Advisory

1) Privilege escalation

Description

The vulnerability allows a remote authenticated attacker to gain elevated privileges on the target system.

The weakness exists due to improper sanitization of a specially crafted authentication request to an affected SharePoint server. A remote attacker can send a specially crafted message to perform a server-side request forgery attack and execute malicious code on a vulnerable server in the context of the SharePoint application pool account.

Successful exploitation of the vulnerability may result in system compromise.

Remediation

Install updates from vendor's website.

External links

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8635

2) Cross-site search attacks

Description

The vulnerability allows a remote authenticated attacker to perform cross-site search attacks.

The weakness exists due to insufficient CSRF protections in certain modes of the search function in Microsoft SharePoint Server. A remote attacker can create a specially crafted HTML page or URL, trick the victim into visiting it, induce the browser to invoke search queries as the logged in user through standard browser functionality to determine whether the query did return results or not, and thus by issuing targeted queries discover facts about documents that are searchable for the logged-in user.

Remediation

Install updates from vendor's website.

External links

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8580

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