Vulnerability Description
A vulnerability in the enhanced Preboot eXecution Environment (PXE) boot loader for Cisco IOS XR 64-bit Software could allow an unauthenticated, remote attacker to execute unsigned code during the PXE boot process on an affected device. The PXE boot loader is part of the BIOS and runs over the management interface of hardware platforms that are running Cisco IOS XR Software only. The vulnerability exists because internal commands that are issued when the PXE network boot process is loading a software image are not properly verified. An attacker could exploit this vulnerability by compromising the PXE boot server and replacing a valid software image with a malicious one. Alternatively, the attacker could impersonate the PXE boot server and send a PXE boot reply with a malicious file. A successful exploit could allow the attacker to execute unsigned code on the affected device. Note: To fix this vulnerability, both the Cisco IOS XR Software and the BIOS must be upgraded. The BIOS code is included in Cisco IOS XR Software but might require additional installation steps. For further information, see the Fixed Software section of this advisory.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Cisco | A9K-Rsp880-Se Firmware | < 10.65 |
| Cisco | Ios Xr | < 6.5.2 |
| Cisco | A9K-Rsp880-Se | - |
| Cisco | A9K-Rsp880-Tr Firmware | < 10.65 |
| Cisco | A9K-Rsp880-Tr | - |
| Cisco | A99-Rp2-Se Firmware | < 14.35 |
| Cisco | A99-Rp2-Se | - |
| Cisco | A99-Rp2-Tr Firmware | < 14.35 |
| Cisco | A99-Rp2-Tr | - |
| Cisco | A99-Rsp-Se Firmware | < 16.14 |
| Cisco | A99-Rsp-Se | - |
| Cisco | A99-Rsp-Tr Firmware | < 16.14 |
| Cisco | A99-Rsp-Tr | - |
| Cisco | A9K-Rsp880-Lt-Se Firmware | < 17.34 |
| Cisco | A9K-Rsp880-Lt-Se | - |
| Cisco | A9K-Rsp880-Lt-Tr Firmware | < 17.34 |
| Cisco | A9K-Rsp880-Lt-Tr | - |
| Cisco | Asr-9901-Rp Firmware | < 22.20 |
| Cisco | Asr-9901-Rp | - |
| Cisco | A99-Rp3-Se Firmware | < 30.23 |
Related Weaknesses (CWE)
References
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iVendor Advisory
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iVendor Advisory
FAQ
What is CVE-2020-3284?
CVE-2020-3284 is a vulnerability with a CVSS score of 9.8 (CRITICAL). A vulnerability in the enhanced Preboot eXecution Environment (PXE) boot loader for Cisco IOS XR 64-bit Software could allow an unauthenticated, remote attacker to execute unsigned code during the PXE...
How severe is CVE-2020-3284?
CVE-2020-3284 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2020-3284?
Check the references section above for vendor advisories and patch information. Affected products include: Cisco A9K-Rsp880-Se Firmware, Cisco Ios Xr, Cisco A9K-Rsp880-Se, Cisco A9K-Rsp880-Tr Firmware, Cisco A9K-Rsp880-Tr.