CVE-2018-0484
Cisco IOS and IOS XE Software Secure Shell Connection on VRF Vulnerability
Published 7 y ago · modified 4 mo ago · JSON
Summary
A vulnerability in the access control logic of the Secure Shell (SSH) server of Cisco IOS and IOS XE Software may allow connections sourced from a virtual routing and forwarding (VRF) instance despite the absence of the vrf-also keyword in the access-class configuration. The vulnerability is due to a missing check in the SSH server. An attacker could use this vulnerability to open an SSH connection to an affected Cisco IOS or IOS XE device with a source address belonging to a VRF instance. Once connected, the attacker would still need to provide valid credentials to access the device.
CISA SSVC assessment
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 23 mo ago
Exploit prediction (EPSS)
0.79% probability of exploitation in the next 30 days, higher than 56% of all scored CVEs.
CVSS scores
| Assigned by | Version | Score | Vector |
|---|---|---|---|
| CNA | 3.0 | 5.3 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
| CNA | 3.0 | 5.3 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
| NVD | 3.0 | 6.5 | CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N |
| NVD | 2.0 | 4.0 | AV:N/AC:L/Au:S/C:N/I:P/A:N |
Affected products
- Cisco Cisco IOS
Classification
- Weakness
- CWE-284 Improper Access Control
- Technology feeds
- Cisco IOS (RSS, critical only)
References
- tools.cisco.com /security/center/content/CiscoSecurityAdvisory/cisco-sa-20190109-ios-ssh-vrf · vendor-advisory, x_refsource_CISCO, x_transferred
- securityfocus.com /bid/106560 · vdb-entry, x_refsource_BID, x_transferred
Sources
- CVE List: CVE-2018-0484
- NVD: CVE-2018-0484
vulnwire keeps one entry per vulnerability: the CVE id wins, then GHSA; records that alias each other are merged. Machine-readable: JSON.