Cisco IOS XE VTY Authentication security bypass
|cisco-iosxe-cve20136979-sec-bypass (89901)||Medium Risk|
Cisco IOS XE could allow a remote attacker to bypass security restrictions, caused by incomplete validations of the Linux-IOS Internal Network interface in VTY Authentication. If the source address is located in the 192.168.x.2 subnets and IP communication is available, an attacker could exploit this vulnerability to gain access to the device with the privilege level as configured against the VTY line, without being prompted for authentication.
Refer to Cisco Security Notice for patch, upgrade or suggested workaround information. See References.
- Cisco Security Notice: Cisco IOS XE Software Telnet Authentication Bypass Vulnerability.
- BID-64502: Cisco IOS XE Software Telnet Remote Authentication Bypass Vulnerability
- CVE-2013-6979: The VTY authentication implementation in Cisco IOS XE 03.02.xxSE and 03.03.xxSE incorrectly relies on the Linux-IOS internal-network configuration, which allows remote attackers to bypass authentication by leveraging access to a 192.168.x.2 source IP address, aka Bug ID CSCuj90227.
- OSVDB ID: 101351: Cisco IOS XE VTY Authentication Implementation Specific Source IP Authentication Bypass
Dec 23, 2013
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