Cisco Security Advisory
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AV:L/AC:L/Au:S/C:P/I:P/A:P/E:F/RL:U/RC:C
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A vulnerability in the Command Line Interface (CLI) parser of Cisco Nexus Operating System (NX-OS) devices could allow an authenticated, local attacker to perform a privilege escalation.
The vulnerability is due to improper input validation of special characters within filenames. An attacker could exploit this vulnerability by authenticating at the local shell and writing a file to disk with certain special characters. The attacker could then use that file with other CLI commands to obtain a shell prompt at their current privilege level. An exploit could allow the attacker to read and write files and perform other privileged commands.
Cisco has confirmed the vulnerability; however, software updates are not available.
To exploit this vulnerability, an attacker must have local access and be able to authenticate to the targeted device. These requirements could limit the possibility of a successful exploit.
Cisco would like to thank Jens Krabbenhoeft for discovering and reporting this vulnerability.
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Cisco has released bug IDs CSCuv08491, CSCuv08443, CSCuv08480, CSCuv08448, CSCuu99291, CSCuv08434, and CSCuv08436 for registered users, which contains additional details and an up-to-date list of affected product versions.
Vulnerable Products
At the time this alert was first published, Cisco Nexus devices running the following Cisco NX-OS Software releases were vulnerable:
- Cisco NX-OS Software release 9.1(1)SV1(3.1.8)
- Cisco NX-OS Software release 7.2(0)ZZ(99.1)
- Cisco NX-OS Software release 7.2(0)ZZ(99.3)
- Cisco NX-OS Software release 4.1(2)E1(1)
- Cisco NX-OS Software release 6.2(12)
- Cisco NX-OS Software release 6.2(11b)
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by these vulnerabilities.
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Administrators are advised to contact the vendor regarding future updates and releases.
Administrators are advised to allow only trusted users to access local systems.
Administrators are advised to allow only privileged users to access administration or management systems.
Administrators are advised to monitor affected systems.
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Software updates are not available.
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The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
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To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
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Show LessVersion Description Section Status Date 1.0 Initial Release NA Final 2015-Jul-01
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