Cisco Security Advisory
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AV:N/AC:M/Au:N/C:P/I:N/A:N/E:F/RL:OF/RC:C
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A vulnerability in the HTTPS session key exchange process of certain Cisco Small Business RV Series Routers and Cisco SA500 Series Security Appliances could allow an unauthenticated, remote attacker to obtain the key pair used in the Transport Layer Security (TLS) session from the affected device.
The vulnerability is due to insufficient sources of entropy used by the random number generator. An attacker could exploit this vulnerability by gathering large amounts of TLS handshake data to predict the random numbers generated for the key pair. An exploit could allow the attacker to decrypt session data between a host and the affected device.
Cisco has released software updates that address this vulnerability. Workarounds that mitigate this vulnerability are not available.
This advisory is available at the following link: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151210-dwvr
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Vulnerable Products
The vulnerability affects the following Cisco Small Business RV Series Routers and Cisco SA500 Series Security Appliances:
- Cisco RV042 Dual WAN VPN Router firmware version 4.0.2.8
- Cisco RV042G Dual Gigabit WAN VPN Router firmware versions 4.2.2.7, 4.2.2.8, and 4.2.1.2
- Cisco RV082 Dual WAN VPN Router firmware versions 4.0.0.7 and 4.0.2.8
- Cisco RV016 Multi-WAN VPN Router firmware versions 4.0.0.7, 4.0.2.8, and 4.0.5.0
- Cisco SA520 Security Appliance version 2.2.07
- Cisco SA520W Security Appliance version 2.2.07
- Cisco SA540 Security Appliance version 2.2.07
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this vulnerability.
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Workarounds are not available.
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When considering software upgrades, customers are advised to consult the Cisco Security Advisories and Responses archive at http://www.cisco.com/go/psirt and review subsequent advisories 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 2015-December-10
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