Full Report
Check Point Research uncovered four critical vulnerabilities in Microsoft Teams that could allow attackers to impersonate executives, manipulate messages, alter notifications, and forge identities during video and audio calls. The research team discovered that both external guest users and malicious insiders could exploit these security flaws, fundamentally undermining the trust that 320 million monthly active […] The post Attackers Exploit Microsoft Teams Flaws to Manipulate Messages and Fake Notifications appeared first on GBHackers Security | #1 Globally Trusted Cyber Security News Platform.
Analysis Summary
Based on the provided context, here is the summarized vulnerability information. Please note that the article only explicitly details one CVE, but explicitly mentions four critical vulnerabilities were found.
# Vulnerability: Microsoft Teams Spoofing and Message/Notification Manipulation Flaws
## CVE Details
- CVE ID: CVE-2024-38197 (Only one explicitly listed in the provided excerpt)
- CVSS Score: 6.5 (Medium) (Only one explicitly listed in the provided excerpt)
- CWE: Spoofing (Likely CWE-347: Improperly Implemented Cryptographic Control or similar)
## Affected Systems
- Products: Microsoft Teams (Web, iOS, Android client components involved in message/call handling)
- Versions: Not explicitly detailed, but affects client versions prior to patch dates.
- Configurations: Exploitable by both external guest users and malicious insiders.
## Vulnerability Description
Check Point Research identified four critical flaws enabling attackers to impersonate executives, manipulate messages, alter notifications, and forge caller identities during video/audio calls. Specifically detailed:
1. **Message Editing:** Attackers could modify messages by manipulating the `clientmessageid` parameter, allowing content replacement without leaving a trace.
2. **Display Name Manipulation:** In private chats, modifying the `conversation topic` parameter allowed attackers to alter display names, misleading participants about the identity of the person they were communicating with.
3. **Notification Spoofing:** Ability to spoof message notifications, presenting false sender identities to exploit urgency associated with authoritative figures.
4. **Caller Identity Forgery:** Modification during call initiation requests allowed forging the caller identity for video/audio calls.
## Exploitation
- Status: PoC available (Demonstrated by Check Point Research)
- Complexity: Not explicitly stated, but sophistication implies low to medium complexity for targeted impersonation.
- Attack Vector: Likely Network, leveraging the platform's communication channels.
## Impact
- Confidentiality: High (Potential for credential harvesting or information disclosure via successful impersonation).
- Integrity: High (Ability to manipulate message content, history, notifications, and caller identity).
- Availability: Low (Direct impact on availability is not the primary concern, but disruption via misinformation is possible).
## Remediation
### Patches
Microsoft released patches addressing the flaws on different timelines:
- Message editing flaw: Fixed on May 8, 2024.
- Display name manipulation issue: Resolved on July 31, 2024.
- Notification spoofing vulnerability (CVE-20...): Patched (timeline truncated, but implied post-July 2024). *Note: The full set of CVEs and their corresponding patches are referenced but not fully listed in the excerpt.*
### Workarounds
- No specific workarounds were identified in the provided text. Mitigation relies on applying vendor-supplied patches.
## Detection
- Detection methods are not specified in detail, but indicators would involve anomalous message edits without corresponding audit logs, or unexpected display names within established chats. Suspiciously urgent communications from known executives should be verified externally.
## References
- Vendor Advisories: Check Point Research disclosed the vulnerabilities to Microsoft on March 23, 2024.
- Relevant Links: research dot checkpoint dot com/2025/microsoft-teams-impersonation-and-spoofing-vulnerabilities-exposed/ (defanged)