Introduction to asr1000-rommon-155-3r.S1.pkg Software
The asr1000-rommon-155-3r.S1.pkg is a critical Read-Only Memory Monitor (ROMMON) firmware package for Cisco ASR 1000 Series routers, specifically designed to address Secure Boot vulnerabilities identified in CVE-2024-20358. This maintenance release strengthens hardware initialization security for ASR 1001/1002-X/1004/1009-X models running IOS XE 17.3 or later.
Released on February 18, 2025, the “155-3r.S1” version string confirms compatibility with routers using ESP200/ESP400 modules. It replaces the deprecated 15.4(3r) firmware that lacked FIPS 140-3 compliant boot validation.
Key Features and Improvements
Secure Boot Architecture
- Implements NIST-approved SHA-384 hashing for firmware signature validation
- Adds UEFI revocation list (dbx) updates to block vulnerable bootloaders
- Enforces hardware root-of-trust verification before IOS XE initialization
Hardware Diagnostic Enhancements
- 40% faster POST (Power-On Self-Test) sequence for ASR 1009-X chassis
- Improved error logging for faulty DRAM modules and PCIe slots
- Automatic recovery from corrupted QFP (QuantumFlow Processor) microcode
Vulnerability Mitigations
- Patches buffer overflow in TFTP boot service (CSCwd93562)
- Removes deprecated RSA-1024 cryptographic routines
- Disables debug interfaces by default in production environments
Compatibility and Requirements
| Component | Minimum Requirement | Recommended |
|---|---|---|
| Chassis Models | ASR 1001-X | ASR 1009-X with ESP400 |
| IOS XE Version | 17.3(1a) | 17.7(1a) |
| Route Processor | ASR1000-RP2 | ASR1000-RP3 |
| Storage | 8 GB USB 3.0 | 16 GB SSD |
Critical Compatibility Notes:
- Not supported on legacy ASR 1002-HX models with ESP5 modules
- Requires WANPHY controller firmware 12.9(2) or newer
- Incompatible with third-party bootloader customization tools
Obtaining the Firmware Package
Network administrators with valid Cisco service contracts can request asr1000-rommon-155-3r.S1.pkg through our authorized distribution portal at https://www.ioshub.net/cisco-asr-downloads. The package includes:
- Digitally signed ROMMON image (SHA-384 verified)
- FIPS 140-3 compliance certificate
- Hardware validation test suite
Verification Protocol:
- Submit CCO ID with TACACS+ administrative privileges
- Provide router serial number for entitlement check
- Download via AES-256 encrypted transfer channel
For emergency security updates or bulk deployment assistance, utilize the portal’s 24/7 priority support with 1-hour SLA response.
This technical overview synthesizes data from Cisco’s ASR 1000 Series security advisories and field deployment guidelines. Always validate configurations against Cisco’s official documentation at software.cisco.com before deployment.
: 网页1中提供了ROMMON升级的具体流程和版本兼容性要求，包括最低ROMMON版本验证、文件复制和验证步骤，这些信息被整合到兼容性要求和获取流程部分。安全漏洞修复内容参考了CVE编号和硬件初始化优化的描述。
