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CVE-2020-3284
CVE ID
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CVE-2020-3284
MITRE ATT&CK
Collection
Command and Control
Credential Access
Defense Evasion
Discovery
Execution
Exfiltration
Impact
Initial Access
Lateral Movement
Persistence
Privilege Escalation
Topic Tags
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.
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CVSS V3 Severity and Metrics
General Information
Vendors
Products
- a99-rp2-se firmware,
- a99-rp2-tr firmware,
- a99-rp3-se firmware,
- a99-rp3-tr firmware,
- a99-rsp-se firmware,
- a99-rsp-tr firmware,
- a9k-rsp5-se firmware,
- a9k-rsp5-tr firmware,
- a9k-rsp880-lt-se firmware,
- a9k-rsp880-lt-tr firmware,
- a9k-rsp880-se firmware,
- a9k-rsp880-tr firmware,
- asr-9901-rp firmware,
- ios xr,
- n540-12z20g-sys-a/d firmware,
- n540-24z8q2c-m firmware,
- n540-28z4c-sys-a/d firmware,
- n540-acc-sys firmware,
- n540x-12z16g-sys-a/d firmware,
- n540x-16z4g8q2c-a/d firmware,
- n560-4-sys firmware,
- n560-7-sys firmware,
- nc55-rp firmware,
- nc55-rp-e firmware,
- ncs-5501 firmware,
- ncs-5501-se firmware,
- ncs-5502 firmware,
- ncs-5502-se firmware,
- ncs-55a1-24h firmware,
- ncs-55a1-24q6h-s firmware,
- ncs-55a1-36h-s firmware,
- ncs-55a1-36h-se-s firmware,
- ncs-55a2-mod-hd-s firmware,
- ncs-55a2-mod-hx-s firmware,
- ncs-55a2-mod-s firmware,
- ncs-55a2-mod-se-h-s firmware,
- ncs-55a2-mod-se-s firmware,
- ncs1001 firmware,
- ncs1002 firmware,
- ncs1004 firmware,
- ncs5001 firmware,
- ncs5002 firmware,
- ncs5011 firmware,
- ncs55-a1-48q6h firmware
Weaknesses
References
Additional Info
Technical Analysis
Report as Emergent Threat Response
Report as Zero-day Exploit
Report as Exploited in the Wild
CVE ID
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