Unauthenticated GSS-TSIG Keytab Update in ManageEngine DDI

Zoho Corporation ManageEngine DDI Central versions 6500 and below are vulnerable to an unauthenticated GSS-TSIG keytab update vulnerability in the Linux Node Agent.

Casky was already ahead

This CVE exploits attack patterns that Casky's 283matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.

Analysis

ManageEngine DDI Central is a critical DNS and DHCP management platform used by enterprises to maintain network infrastructure. Versions 6500 and below contain an unauthenticated vulnerability allowing attackers to update GSS-TSIG keytab files through the Linux Node Agent without requiring credentials. This is particularly dangerous because GSS-TSIG (Generic Security Service TSIG) keytabs are cryptographic materials used to authenticate DNS zone transfers and dynamic updates—compromising them grants attackers the ability to forge DNS responses, redirect traffic, or inject malicious records into organizational DNS systems. Organizations running vulnerable DDI Central instances face immediate risks to DNS integrity, potential lateral movement opportunities, and supply chain impacts if their DNS infrastructure serves downstream systems.

Casky's 283 mapped security skills leverage Claude's extended reasoning to correlate attack patterns across MITRE ATT&CK's Privilege Escalation (TA0004) and Credential Access (TA0006) techniques. Practitioners using Casky would identify reconnaissance activities probing for exposed DDI Central agents, followed by exploitation attempts targeting the unauthenticated keytab endpoint—flagging suspicious HTTP/HTTPS requests with modification payloads to predictable agent paths. The platform's skills detect secondary indicators including unexpected authentication material changes in DNS logs, anomalous zone transfer patterns, and configuration drift in TSIG trust relationships. By correlating these signals through Claude's reasoning engine, practitioners gain visibility into the full attack chain: from initial access through credential compromise to persistence via DNS infrastructure manipulation, enabling rapid incident response before attackers establish lasting control over organizational DNS systems.

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Casky Risk Score

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EPSS Probability

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Shodan Exposure

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GreyNoise Signal

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283 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-95651.

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

Access with Stolen Session Cookie

identity access management · low

Run

MITRE ATT&CK Techniques

TA0004 TA0006

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