CVE-2019-1836

published 2019-05-03

CVE-2019-1836: A vulnerability in the system shell for Cisco Nexus 9000 Series Fabric Switches in Application Centric Infrastructure (ACI) mode could allow an authenticated…

Priority P4 29 high 7.1 CVSS 3.1

AV L AC L PR L UI N S U C N I H A H

A vulnerability in the system shell for Cisco Nexus 9000 Series Fabric Switches in Application Centric Infrastructure (ACI) mode could allow an authenticated, local attacker to use symbolic links to overwrite system files. These system files may be sensitive and should not be overwritable by non-root users. The attacker would need valid device credentials. The vulnerability is due to incorrect symbolic link verification of directory paths when they are used in the system shell. An attacker could exploit this vulnerability by authenticating to the device and providing crafted user input to specific symbolic link CLI commands. Successful exploitation could allow the attacker to overwrite system files that should be restricted. This vulnerability has been fixed in software version 14.1(1i).

Affected

3 ranges

Vendor	Product	Version range	Fixed in
cisco	cisco_nx-os_software_for_nexus_9000_series_fabric_switches_aci_mode	>= unspecified < 14.1(1i)	14.1(1i)
cisco	nexus_9000_series_fabric_switches_application_centric_infrastructure_mode_symbol	—	—
cisco	nx-os	—	—

CVSS provenance

nvd v3.1 7.1 HIGH CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

nvd v3.0 5.5 MEDIUM CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

nvd v2.0 6.6 MEDIUM AV:L/AC:L/Au:N/C:N/I:C/A:C

vendor_cisco 5.5 MEDIUM

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