A vulnerability in SQL*Net inspection engine code could allow an unauthenticated, remote attacker to cause a reload of the affected system.
The vulnerability is due to improper handling of segmented Transparent Network Substrate (TNS) packets. An attacker could exploit this vulnerability by sending a crafted sequence of segmented TNS packets through the affected system.
Cisco has confirmed the vulnerability in a security advisory and released software updates.
Indicators of Compromise
Cisco Firewall Services Module Software versions prior to 3.2(27) and 4.1(14) and Cisco Adaptive Security Appliance Software versions prior to 7.2(5.12), 8.2(5.44), 8.3(2.39), 8.4(6), 8.5(1.18), 8.6(1.12), 8.7(1.6), 9.0(2.10), and 9.1(2) are vulnerable.
The vulnerability is due to improper handling of TNS packets by the SQL*Net Inspection Engine.
An unauthenticated, remote attacker could exploit this vulnerability by sending malicious TNS packets that cross interfaces on the device where SQL*Net Inspection is enabled. Processing the packets could cause the device to reload, resulting in a DoS condition.
Only devices that have SQL*Net Inspection enabled are vulnerable. Additionally, only transit traffic can trigger the vulnerability. These factors reduce the risk of exploitation.
Administrators are advised to apply the appropriate updates.
Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.
Administrators are advised to monitor affected systems.
Cisco customers with active contracts can obtain updates through the Software Center at the following link: Cisco. Cisco customers without contracts can obtain upgrades by contacting the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via email at firstname.lastname@example.org.
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Cisco Multivendor Vulnerability Alerts respond to vulnerabilities identified in third-party vendors' products. These alerts contain information compiled from diverse sources and provide comprehensive technical descriptions, objective analytical assessments, workarounds and practical safeguards, and links to vendor advisories and patches.