#VU7178 Privilege escalation in Cisco IOS XR - CVE-2017-6718

Vulnerability identifier: #VU7178

Vulnerability risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2017-6718

CWE-ID: CWE-77

Exploitation vector: Local

Exploit availability: No

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

Vendor: Cisco Systems, Inc

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

The vulnerability exists in the CLI of Cisco IOS XR Software due to incorrect permission settings on binary files. A local attacker can send specially crafted commands to the affected device, overwrite binaries on the filesystem and gain root privileges.

Successful exploitation of the vulnerability results in privileges escalation.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Cisco IOS XR: 6.2.1

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External links
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170621-ios1

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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.