CVE-2019-1901: Cisco Nexus 9000 Series ACI Mode Switch Software Link Layer Discovery Protocol Buffer Overflow Vulnerability
First published: Wed Jul 31 2019(Updated: )
A vulnerability in the Link Layer Discovery Protocol (LLDP) subsystem of Cisco Nexus 9000 Series Application Centric Infrastructure (ACI) Mode Switch Software could allow an adjacent, unauthenticated attacker to cause a denial of service (DoS) condition or execute arbitrary code with root privileges. The vulnerability is due to improper input validation of certain type, length, value (TLV) fields of the LLDP frame header. An attacker could exploit this vulnerability by sending a crafted LLDP packet to the targeted device. A successful exploit may lead to a buffer overflow condition that could either cause a DoS condition or allow the attacker to execute arbitrary code with root privileges. Note: This vulnerability cannot be exploited by transit traffic through the device; the crafted packet must be targeted to a directly connected interface. This vulnerability affects Cisco Nexus 9000 Series Fabric Switches in ACI mode if they are running a Cisco Nexus 9000 Series ACI Mode Switch Software release prior to 13.2(7f) or any 14.x release.
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco NX-OS | <13.2\(7f\) | |
| Cisco NX-OS | >=14.0\(1h\)<=14.1\(2g\) | |
| Cisco Nexus | ||
| Cisco Nexus 93108TC-FX Switch | ||
| Cisco Nexus 93120TX Firmware | ||
| Cisco Nexus 93128 Firmware | ||
| Cisco Nexus 93180LC-EX Switch | ||
| Cisco Nexus 93180YC-EX-24 | ||
| Cisco Nexus 93180YC-FX Firmware | ||
| Cisco Nexus 9332PQ Firmware | ||
| Cisco Nexus 9336C-FX2 Firmware | ||
| Cisco Nexus N9336PQ | ||
| Cisco Nexus 9348GC-FXP Firmware | ||
| Cisco Nexus 9364c-h1 | ||
| Cisco Nexus 9372PX-E | ||
| Cisco Nexus 9372PX-E Firmware | ||
| Cisco Nexus 9372TX | ||
| Cisco Nexus 9372TX-E Switch | ||
| Cisco Nexus 9396PX Firmware | ||
| Cisco Nexus 9396TX Firmware | ||
| Cisco Nexus 9504 firmware | ||
| Cisco Nexus 9508 | ||
| Cisco Nexus 9516 firmware | ||
| Cisco Nexus 93240YC-FX2 Firmware | ||
| Cisco Nexus 9332C Firmware |
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Reference Links
Frequently Asked Questions
What is CVE-2019-1901?
CVE-2019-1901 is a vulnerability in the Link Layer Discovery Protocol (LLDP) subsystem of Cisco Nexus 9000 Series Application Centric Infrastructure (ACI) Mode Switch Software.
How severe is CVE-2019-1901?
CVE-2019-1901 has a severity rating of 8.8 (high severity).
Which Cisco products are affected by CVE-2019-1901?
Cisco Nx-os versions up to 13.2(7f) and versions between 14.0(1h) and 14.1(2g) are affected by CVE-2019-1901.
What are the possible impacts of CVE-2019-1901?
CVE-2019-1901 may allow an adjacent, unauthenticated attacker to cause a denial of service (DoS) condition or execute arbitrary code with root privileges.
How can I fix CVE-2019-1901?
To fix CVE-2019-1901, it is recommended to update to a patched version of Cisco Nx-os.
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- vendor/cisco
- canonical/cisco nx-os
- version/cisco nx-os/14.0\(1h\)
- version/cisco nx-os/14.1\(2g\)
- canonical/cisco nexus
- canonical/cisco nexus 93108tc-fx switch
- canonical/cisco nexus 93120tx firmware
- canonical/cisco nexus 93128 firmware
- canonical/cisco nexus 93180lc-ex switch
- canonical/cisco nexus 93180yc-ex-24
- canonical/cisco nexus 93180yc-fx firmware
- canonical/cisco nexus 9332pq firmware
- canonical/cisco nexus 9336c-fx2 firmware
- canonical/cisco nexus n9336pq
- canonical/cisco nexus 9348gc-fxp firmware
- canonical/cisco nexus 9364c-h1
- canonical/cisco nexus 9372px-e
- canonical/cisco nexus 9372px-e firmware
- canonical/cisco nexus 9372tx
- canonical/cisco nexus 9372tx-e switch
- canonical/cisco nexus 9396px firmware
- canonical/cisco nexus 9396tx firmware
- canonical/cisco nexus 9504 firmware
- canonical/cisco nexus 9508
- canonical/cisco nexus 9516 firmware
- canonical/cisco nexus 93240yc-fx2 firmware
- canonical/cisco nexus 9332c firmware