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Cisco Small Business Switches SSH Packet Processing Denial of Service Vulnerability

Cisco-SA-20130306-CVE-2013-1154 · Medium · Published · Updated

Cisco Small Business Switches contain a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition to features that rely on SSH or SSL protocols. The vulnerability is due to the processing flaw in malformed packets in the code used by SSH and SSL. An unauthenticated, remote attacker could exploit this vulnerability by sending malformed SSH or SSL packets to the device. An exploit could allow the attacker to cause a denial of service for the features requiring SSH or SSL support. Cisco has confirmed this vulnerability and released updated software. To exploit this vulnerability, an attacker must be able to send crafted SSH or SSL packets to the targeted device which may require the attacker to have access to trusted, internal networks, decreasing the likelihood of a successful attack. The vulnerability does not affect the entire device. Features that need the SSL/TLS layer to encrypt data such as SSH, HTTPS, and Secure Sensitive Data are affected. Cisco would like to thank Hisashi Kojima and Masahiro Nakada of Fujitsu Laboratories LTD for discovering this vulnerability.

Cisco advisory ·CSAF JSON

Workarounds

Administrators are advised to apply the appropriate updates.

Administrators are advised to allow only trusted users to have network access.

Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.

Administrators can help protect affected systems from external attacks by using a solid firewall strategy.

Administrators are advised to monitor critical systems.

CVEsCVE-2013-1154
Cisco Bug IDsCSCua30246
CVSS ScoreBase 5.0
Base 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P/E:F/RL:OF/RC:C
Product Names From Source
Cisco Small Business 200 Series Smart Switches, Cisco Small Business 300 Series Managed Switches, Cisco Small Business 500 Series Stackable Managed Switches

CSAF Product Statuses

Product Status Source CVE Rows
Cisco Small Business 200 Series Smart Switches known_affected cisco_csaf CVE-2013-1154 1
Cisco Small Business 300 Series Managed Switches known_affected cisco_csaf CVE-2013-1154 1
Cisco Small Business 500 Series Stackable Managed Switches known_affected cisco_csaf CVE-2013-1154 1

Related Products

Product CVE Evidence
Cisco Small Business 200 Series Smart Switches CVE-2013-1154 Cisco OpenVuln · family-level
Cisco Small Business 300 Series Managed Switches CVE-2013-1154 Cisco OpenVuln · family-level
Cisco Small Business 500 Series Stackable Managed Switches CVE-2013-1154 Cisco OpenVuln · family-level
200 Series Smart Switches CVE-2013-1154 Cisco OpenVuln · family-level
300 Series Managed Switches CVE-2013-1154 Cisco OpenVuln · family-level
500 Series Stackable Managed Switches CVE-2013-1154 Cisco OpenVuln · family-level