Cisco Security AdvisoryMedium
Advisory ID:
cisco-sa-20161012-waas
First Published:
2016 October 12 16:00 GMT
Version 1.0:
Workarounds:
Cisco Bug IDs:
CVSS Score:
Base 4.3,
Temporal 3.6
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AV:N/AC:M/Au:N/C:N/I:N/A:P/E:F/RL:OF/RC:C
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AV:N/AC:M/Au:N/C:N/I:N/A:P/E:F/RL:OF/RC:C
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A vulnerability in the SSL session cache management of Cisco Wide Area Application Services (WAAS) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition due to high consumption of disk space. The user would see a performance degradation.
The vulnerability is due to a lack of file size limitations for SSL system files stored on the disk. An attacker could exploit this vulnerability by sending a continuous stream of SSL traffic to the targeted device. An exploit could allow the attacker to cause a DoS condition due to the adverse impact on device performance.
Cisco has released software updates that address this vulnerability. There are workarounds that address this vulnerability.
This advisory is available at the following link:
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20161012-waas
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Vulnerable Products
Cisco Wide Area Application Services (WAAS) is affected. Cisco provides information about affected releases in Cisco bugs, which are accessible through the Cisco Bug Search Tool.
This vulnerability applies to:
- SSL (TCP port 443) management traffic of the WAAS Central Manager (CM)
- The WAAS accelerators receiving SSL connection requests
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this vulnerability.
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The SSL cache files can be removed from the disk. This is a temporary workaround that will mitigate the vulnerability until the files again grow in size. The administrator can use the following command sequence to remove the SSL cache files:
#waas> config #waas(config)> no cms enable #waas(config)> cms enable #waas(config)> exit #waas> service restart rpc_httpd
Contact the Cisco Technical Assistance Center (TAC) for a script to update the configuration of the SSL cache files.
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Cisco provides information about fixed software in Cisco bugs, which are accessible through the Cisco Bug Search Tool.
When considering software upgrades, customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories and Alerts page, to determine exposure and a complete upgrade solution.
In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.
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The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
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To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
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Show LessVersion Description Section Status Date 1.0 Initial public release. — Final 2016-October-12
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