Vulnerability identifier: #VU11347

Vulnerability risk: Low

CVSSv3.1: 5.8 [CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-0169

CWE-ID: CWE-77

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Cisco IOS XE
Operating systems & Components / Operating system

Vendor: Cisco Systems, Inc

Description
The vulnerability allows a local attacker to gain elevated privileges on the target system.

The weakness exists in the CLI parser of Cisco IOS XE Software due to the affected software improperly sanitizing command arguments to prevent access to internal data structures on a device. A local attacker with privileged EXEC mode (privilege level 15) access can execute CLI commands that contain crafted arguments, gain access to the underlying Linux shell  and execute arbitrary commands with root privileges.

Mitigation
The vulnerability is addressed in the following version: 15.0(9.0)PKD, 3.2(0)SE, 16.1.116.1(0.196), 15.6(2.13)SP3, 15.6(2)SP4, 15.5(3)S6.17, 15.5(1.0.93)SY1, 15.5(1)SY1, 
15.5(1)IC1.112, 15.5(1)IA1.533, 15.4(3)S9, 15.4(3)S8.7, 15.4(1.1.21)SY4, 15.4(1)SY4, 15.2(6.5.3i)E1
15.2(6.4.81i)E1, 15.2(6)E1, 15.2(2)E8, 15.2(1)SY6, 15.2(1)SY5.128, 15.1(2)SY11.56, 15.0(1.9.1)SQD8, 12.2(60)EZ13.

Vulnerable software versions

Cisco IOS XE: 15.0.5.59 EMD - 16.2.0

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External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-privesc1

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.