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Вебинар: Механизмы в SAST-решениях для выявления дефектов из OWASP Top Ten - 12.03
The string "SSH-2.0-Cisco-1.25" is not a specific vulnerability name, but rather a version banner
The SSH-2-Cisco-1.25 vulnerability, also known simply as a weakness in certain SSH implementations, has garnered significant attention in the cybersecurity community. This vulnerability poses a substantial risk to network administrators and security professionals, as it can be exploited to gain unauthorized access to systems and networks. In this blog post, we'll explore the intricacies of the SSH-2-Cisco-1.25 vulnerability, its implications, and most importantly, how to protect your systems against potential exploitation.
According to the technical analysis, the flaw exists because the utility utilizes a static, hard-coded credential set. In secure software design, credentials should be dynamic, generated upon installation, or heavily hashed. In this case, a "skeleton key"—a default username and password—was left active and accessible within the application’s architecture.
Security reports indicate a massive attack surface for devices identifying as SSH-2.0-Cisco-1.25 Würth Phoenix Shodan/Censys Data : Scans from late April 2025 found between 92,000 and 103,000 exposed instances
The identifier "SSH20CISCO125" has circulated among security research circles to denote the specific mechanism of the static credential injection.
If you're concerned about this vulnerability, make sure to:
Access Control Lists (ACLs): Restrict SSH access (TCP port 22) only to known, trusted management IP addresses. Do not leave SSH open to the entire subnet or the public internet.
Step 1: Open TCP port 22 to target.
Step 2: Send SSH protocol banner: "SSH-2.0-SSH20CISCO125_PoC"
Step 3: Send MSG_KEXINIT with cookie = [0x41]*16 (16 bytes of 'A')
Step 4: Send malformed DH group exchange:
min_group_size = 0xFFFF (invalid)
preferred_size = 0x400 (valid)
Step 5: Server crashes SSH process OR replies with leaked heap memory containing portions of 'enable secret' hash.
The string "SSH-2.0-Cisco-1.25" is not a specific vulnerability name, but rather a version banner
The SSH-2-Cisco-1.25 vulnerability, also known simply as a weakness in certain SSH implementations, has garnered significant attention in the cybersecurity community. This vulnerability poses a substantial risk to network administrators and security professionals, as it can be exploited to gain unauthorized access to systems and networks. In this blog post, we'll explore the intricacies of the SSH-2-Cisco-1.25 vulnerability, its implications, and most importantly, how to protect your systems against potential exploitation. ssh20cisco125 vulnerability exclusive
According to the technical analysis, the flaw exists because the utility utilizes a static, hard-coded credential set. In secure software design, credentials should be dynamic, generated upon installation, or heavily hashed. In this case, a "skeleton key"—a default username and password—was left active and accessible within the application’s architecture. The string "SSH-2
Security reports indicate a massive attack surface for devices identifying as SSH-2.0-Cisco-1.25 Würth Phoenix Shodan/Censys Data : Scans from late April 2025 found between 92,000 and 103,000 exposed instances According to the technical analysis, the flaw exists
The identifier "SSH20CISCO125" has circulated among security research circles to denote the specific mechanism of the static credential injection.
If you're concerned about this vulnerability, make sure to:
Access Control Lists (ACLs): Restrict SSH access (TCP port 22) only to known, trusted management IP addresses. Do not leave SSH open to the entire subnet or the public internet.
Step 1: Open TCP port 22 to target.
Step 2: Send SSH protocol banner: "SSH-2.0-SSH20CISCO125_PoC"
Step 3: Send MSG_KEXINIT with cookie = [0x41]*16 (16 bytes of 'A')
Step 4: Send malformed DH group exchange:
min_group_size = 0xFFFF (invalid)
preferred_size = 0x400 (valid)
Step 5: Server crashes SSH process OR replies with leaked heap memory containing portions of 'enable secret' hash.