Overview
This technical report details a high-risk vulnerability known as CVE-2023-32889 that exists in the Modem IMS Call UA. The vulnerability, which is due to a missing bounds check, could lead to a remote denial of service (DoS) attack. This vulnerability is significant because it can be exploited without any user interaction, potentially compromising systems or leading to data leakage.
Vulnerability Summary
CVE ID: CVE-2023-32889
Severity: High (7.5 CVSS)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: The vulnerability could result in remote denial of service and potential system compromise or data leakage.
Affected Products
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Product | Affected Versions
Modem IMS Call UA | All versions prior to patch MOLY01161825
How the Exploit Works
The CVE-2023-32889 exploit takes advantage of a missing bounds check in the Modem IMS Call UA. This allows an attacker to write out of bounds, causing the system to crash and resulting in a denial of service. In some cases, this may also lead to system compromise or data leakage.
Conceptual Example Code
Here is a conceptual example of how the vulnerability might be exploited, using a malicious payload that exceeds the expected bounds:
POST /modem/ims/call HTTP/1.1
Host: target.example.com
Content-Type: application/octet-stream
{ "call_data": "AAAAAAAAAAAAAAAAAAAAAAAA..." } // excessively longThe above example would lead to an out-of-bounds write, causing the system to crash and potentially leading to further exploitation.
Mitigation Guidance
To mitigate the risks associated with this vulnerability, users and administrators are advised to apply the vendor-provided patch identified as MOLY01161825. If this is not viable, the use of a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation.
