SB2023091254 - Multiple vulnerabilities in Microsoft Exchange Server
Published: September 12, 2023 Updated: April 9, 2024
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 5 secuirty vulnerabilities.
1) Deserialization of Untrusted Data (CVE-ID: CVE-2023-36745)
The vulnerability allows a remote user to execute arbitrary code on the target system.
The vulnerability exists due to insecure input validation when processing serialized data using the known (Type 4) UnitySerializationHolder gadget. A remote user on the local network can pass specially crafted data to the application and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
2) Deserialization of Untrusted Data (CVE-ID: CVE-2023-36756)
The vulnerability allows a remote user to execute arbitrary code on the target system.
The vulnerability exists due to insecure input validation when processing serialized data within the ApprovedApplicationCollection class. A remote user can pass specially crafted data to the application and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
3) Improper Authentication (CVE-ID: CVE-2023-36757)
The vulnerability allows a remote user to compromise the affected system.
The vulnerability exists due to an error in the processing authentication requests. A remote user on the local network can obtain a victim's Net-NTLMv2 hash and perform an NTLM Relay attack against another service to authenticate as the user.
4) Information disclosure (CVE-ID: CVE-2023-36777)
The vulnerability allows a remote user to gain access to potentially sensitive information.
The vulnerability exists due to insecure deserialization within the ProjectInstance class. A remote user on the local network can gain unauthorized access to sensitive information on the system.
5) Deserialization of Untrusted Data (CVE-ID: CVE-2023-36744)
The vulnerability allows a remote user to execute arbitrary code on the target system.
The vulnerability exists due to insecure input validation when processing serialized data within the DumpDataReader class. A remote user can pass specially crafted data to the application and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Remediation
Install update from vendor's website.
References
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2023-36745
- https://techcommunity.microsoft.com/t5/exchange-team-blog/released-august-2023-exchange-server-security-updates/ba-p/3892811
- https://www.zerodayinitiative.com/advisories/ZDI-23-1448/
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2023-36756
- https://www.zerodayinitiative.com/advisories/ZDI-23-1419/
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2023-36757
- https://www.zerodayinitiative.com/advisories/ZDI-23-1447/
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2023-36777
- https://www.zerodayinitiative.com/advisories/ZDI-23-1418/
- https://www.zerodayinitiative.com/advisories/ZDI-23-1417/
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2023-36744
- https://www.zerodayinitiative.com/advisories/ZDI-23-1420/