Vulnerability identifier: #VU7370

Vulnerability risk: Low

CVSSv3.1: 7.7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-6707

CWE-ID: CWE-78

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Cisco ASR 5000 Series
Hardware solutions / Firmware

Vendor: Cisco Systems, Inc

Description
The vulnerability allows a local attacker to execute arbitrary shell commands.

The weakness exists in the CLI command-parsing code of the Cisco StarOS operating system due to insufficient sanitization of commands before inserting them into Linux shell commands. A local attacker can break from the StarOS CLI, submit and execute a specially crafted CLI command with root privileges.

Successful exploitation of the vulnerability may result in system compromise.

Mitigation
The vulnerability is addressed in the following versions:
21.3.A0.66618, 21.3.A0.66178, 21.3.A0.66153, 21.3.A0.66135, 21.2.R0.66287, 21.2.M0.66444, 21.2.M0.66307, 21.2.M0.66249, 21.2.M0.66176, 21.2.M0.66149, 21.2.M0.66133, 21.2.0.66846, 21.2.0, 21.1.b0.66191, 21.1.V0.66492, 21.1.1.66446, 21.1.1, 21.1.0.66154, 21.1.0.66134, 21.1.0, 20.3.T0.66312, 20.3.T0.66236, 20.3.T0.66216, 20.3.T0.66156, 20.3.M0.66295, 20.3.M0.66234, 20.3.M0.66214, 20.3.M0.66152, 20.2.9.66292, 20.2.9.66232, 20.2.9, 20.2.8.66212, 20.2.8.66150, 20.2.8, 19.7.M0.67048, 19.6.5.67047, 19.6.5, 18.7.6.67108, 18.7.6.

Vulnerable software versions

Cisco ASR 5000 Series: 18.7.6 - 21.1.1

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External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170705-asrcmd

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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.