Cisco IOS Software contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition.
The vulnerability is due to errors in the Wide Area Application Services (WAAS) Express feature. An unauthenticated, remote attacker could exploit this vulnerability to cause the targeted device to leak memory or reset, resulting in a DoS condition.
Cisco has confirmed the vulnerability in a security advisory and released updated software.
Indicators of Compromise
Cisco has published a list of affected Cisco IOS Software releases in the security advisory. The Vendor Announcements section of this alert contains a link to the advisory.
The vulnerability is due to unspecified errors in the WAAS Express feature.
An unauthenticated, remote attacker could exploit this vulnerability by submitting transit traffic to the targeted device. Processing the transit traffic could cause the targeted device to leak memory or reset; sustained attacks could lead to a DoS condition.
To exploit this vulnerability, the targeted device must be configured with waas enable; additionally, the attacker would need to submit transit traffic through an affected device. To achieve this objective, the attacker may need access to trusted, internal network resources. This access requirement reduces the exposure of this vulnerability.
Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
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 devices.
Administrators are advised to allow only trusted users to have network access.
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 e-mail at email@example.com.
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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.