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CVE-2019-1593

HIGHCVSS 7.8/10EPSS 0.38%

Last modified

CVE-2019-1593 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. A vulnerability in the Bash shell implementation for Cisco NX-OS Software could allow an authenticated, local attacker to escalate their privilege level by executing commands authorized to other user roles. The attacker must authenticate with valid user credentials. EPSS estimates a 0.38% chance of exploitation in the next 30 days.

Description

A vulnerability in the Bash shell implementation for Cisco NX-OS Software could allow an authenticated, local attacker to escalate their privilege level by executing commands authorized to other user roles. The attacker must authenticate with valid user credentials. The vulnerability is due to the incorrect implementation of a Bash shell command that allows role-based access control (RBAC) to be bypassed. An attacker could exploit this vulnerability by authenticating to the device and entering a crafted command at the Bash prompt. A successful exploit could allow the attacker to escalate their privilege level by executing commands that should be restricted to other roles. For example, a dev-ops user could escalate their privilege level to admin with a successful exploit of this vulnerability.

Metrics

CVSS 3.1
7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
0.38%

29.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoNx-Os>= 7.0\(3\)i5, < 7.0\(3\)i7\(4\)
CiscoNx-Os>= 7.0\(3\)i4, < 7.0\(3\)i4\(9\)
CiscoNx-Os>= 7.0\(3\), < 7.0\(3\)i7\(4\)
CiscoNx-Os>= 7.0\(3\), < 7.0\(3\)f3\(5\)
CiscoNx-Os>= 8.1, < 8.2\(3\)
CiscoNx-Os>= 8.3, < 8.3\(1\)
CiscoNx-Os< 13.2\(4d\)
CiscoNx-Os>= 14.0, < 14.0\(1h\)

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2019-1593?
A vulnerability in the Bash shell implementation for Cisco NX-OS Software could allow an authenticated, local attacker to escalate their privilege level by executing commands authorized to other user roles. The attacker must authenticate with valid user credentials. The vulnerability is due to the incorrect implementation of a Bash shell command that allows role-based access control (RBAC) to be bypassed. An attacker could exploit this vulnerability by authenticating to the device and entering a crafted command at the Bash prompt. A successful exploit could allow the attacker to escalate their privilege level by executing commands that should be restricted to other roles. For example, a dev-ops user could escalate their privilege level to admin with a successful exploit of this vulnerability.
How severe is CVE-2019-1593?
CVE-2019-1593 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.38% probability of exploitation in the next 30 days.
How do I fix CVE-2019-1593?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST