PT-2023-6951 · Microsoft · Exchange Server

Chudypb + 1 · Published 2023-08-22 · Updated 2024-05-29 · CVE-2023-36039

Positive Technologies (AI Summary)

CVSS v3.1

8.0

High

Base vector

AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Microsoft Exchange Server (affected versions not specified)

Description The issue is related to a deserialization flaw in the Microsoft Exchange Server, specifically with the SerializationTypeConverter class, which can be exploited due to insufficient protection of service data during NTLM authentication. This can allow a remote attacker to conduct spoofing attacks. The vulnerability involves the deserialization of untrusted data and can be used for NTLM relay attacks, potentially allowing an attacker to impact the system.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Deserialization of Untrusted Data

Improper Authentication

Information Disclosure

Weakness Enumeration

CWE-502

CWE-287

CWE-200

Related Identifiers

BDU:2023-07970

CVE-2023-36039

ZDI-23-1641

Affected Products

Exchange Server

References · 8

• https://zerodayinitiative.com/advisories/ZDI-23-1641 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-36039 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2023-36039 · Vendor Advisory
• https://bdu.fstec.ru/vul/2023-07970 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2023-36039 · Security Note
• https://t.me/avleonovcom/1153 · Telegram Post
• https://cybersecurity-help.cz/vdb/SB2023111454 · Note
• https://twitter.com/chudyPB/status/1724489497432244391 · Twitter Post