JetAudio jetCast Server 2.0 Stack-Based Buffer Overflow

JetAudio jetCast Server 2.0 is susceptible to a stack-based buffer overflow vulnerability (CVE-2019-25609) within the Log Directory configuration field. This flaw allows a local attacker with access to the server’s configuration settings to overwrite Structured Exception Handling (SEH) pointers. By injecting carefully crafted, alphanumeric-encoded shellcode into the Log Directory field, an attacker can trigger an SEH exception handler. This ultimately leads to the execution of arbitrary code under the privileges of the application. The vulnerability poses a significant risk to systems running the vulnerable software, as it enables local privilege escalation and potentially complete system compromise.

Attack Chain

1. Attacker gains local access to a system running JetAudio jetCast Server 2.0.
2. Attacker identifies the Log Directory configuration setting within JetCast Server 2.0.
3. The attacker crafts alphanumeric shellcode designed to overwrite the SEH chain.
4. The attacker injects the malicious shellcode into the Log Directory configuration field, exceeding the expected buffer size.
5. The application attempts to handle the oversized input, causing a stack-based buffer overflow.
6. The overflow corrupts the SEH chain, replacing legitimate handler addresses with attacker-controlled addresses.
7. An exception is triggered within the application due to the corrupted state.
8. The SEH handler is invoked, redirecting execution to the attacker’s shellcode, resulting in arbitrary code execution with application privileges.

Impact

Successful exploitation of this vulnerability allows a local attacker to execute arbitrary code with the privileges of the JetAudio jetCast Server application. Given the base CVSS score of 8.4, this could lead to complete system compromise, including data theft, modification, or destruction. While the number of affected installations is unknown, organizations utilizing JetAudio jetCast Server 2.0 are at risk.

Recommendation

• Apply available patches or upgrade to a secure version of JetAudio jetCast Server to remediate CVE-2019-25609.
• Monitor process creation events for unusual processes spawned by the JetAudio jetCast Server process (see process creation rule below).
• Implement access controls to restrict who can modify the Log Directory configuration, mitigating the initial access vector.
• Monitor network connections originating from the JetAudio jetCast Server process to detect potential command and control activity after successful exploitation (see network connection rule below).