It was discovered that CryptX did not verify authentication tags while
performing GCM and ChaCha20-Poly1305 decryption. An attacker could possibly
use this issue to cause CryptX to accept modified ciphertext, leading to
data integrity violations or authentication bypass. This issue only
affected Ubuntu 18.04 LTS. (CVE-2018-25099)
It was discovered that CryptX included a version of the tomcrypt library
that was susceptible to malformed unicode handling. An attacker could
possibly use this issue to cause unexpected behavior or incorrect
processing of crafted input. This issue only affected Ubuntu 18.04 LTS.
(CVE-2025-40912)
It was discovered that CryptX included a version of the libtommath library
that was susceptible to an integer overflow. An attacker could possibly use
this issue to cause memory corruption or a denial of service.
(CVE-2025-40914)
Intelligence View
⚡ tsecurity.de Intelligence
USN-8128-1: CryptX vulnerabilities
It was discovered that CryptX did not verify authentication tags while performing GCM and ChaCha20-Poly1305 decryption. An attacker could possibly use this issue to cause CryptX to accept modified ciphertext, leading to data integrity…
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IoC Intelligence (3 Indikatoren)
CVE-2018-25099CVE-2025-40912CVE-2025-40914
IR-PLAYBOOK-VULN-REMEDIATIONMEDIUM
Schritte anzeigen
SOC Incident Playbook: Vulnerability Remediation & Verification
1-Click Detection Engineering: Multi-Dialect SIEM Rules5 Formate
Regeln anzeigen
Syntax validiert (0 Fehler)
title: Detect Exploitation - USN-8128-1: CryptX vulnerabilities
id: 31e62f7f-2e7c-4884-9064-3cae1be5e3cb
status: experimental
description: Automatisch generierte SIEM-Erkennungsregel basierend auf CTI Intelligence
references:
- https://tsecurity.de/
author: iShareStuff CTI Automated Detection Engine
date: 2026-09-25
logsource:
category: network_connection
product: any
detection:
selection:
CommandLine|contains:
- 'exploit'
condition: selection
falsepositives:
- Legitime administrative Zugriffe oder Penetrationstests
level: high
tags:
- attack.initial_accessSyntax validiert (0 Fehler)
rule CTI_Threat_Indicator {
meta:
author = "iShareStuff CTI Automated Detection Engine"
date = "2026-09-25"
description = "YARA Signature for "
strings:
$str = "USN-8128-1: CryptX vulnerabili" ascii wide
condition:
any of them
}Syntax validiert (0 Fehler)
index=security sourcetype IN ("cisco:asa", "pan:traffic", "zeek_conn", "suricata", "WinEventLog:Security")
("USN-8128-1 CryptX vulnerabilities")
| stats count earliest(_time) as first_seen latest(_time) as last_seen by src_ip, dest_ip, dest_host, signature
| eval first_seen=strftime(first_seen, "%Y-%m-%d %H:%M:%S"), last_seen=strftime(last_seen, "%Y-%m-%d %H:%M:%S")
| sort - countSyntax validiert (0 Fehler)
message: "*USN-8128-1 CryptX vulnerabilities*"Syntax validiert (0 Fehler)
CommonSecurityLog
| where Message has "USN-8128-1 CryptX vulnerabilities"
| summarize EventCount = count(), FirstSeen = min(TimeGenerated), LastSeen = max(TimeGenerated) by SourceIP, DestinationIP, DestinationPort, Activity
| extend DetectionRule = "iShareStuff-CTI-Compiled"
| sort by EventCount desc🎯
MITRE ATT&CK Matrix Navigator 14 Taktiken
Reconnaissance
-
Resource Development
-
Initial Access
Execution
Persistence
-
Privilege Escalation
Defense Evasion
Credential Access
-
Discovery
-
Lateral Movement
-
Collection
-
Command and Control
Exfiltration
-
Impact
🌐
Supply-Chain Blast Radius & Dependency Topology CVE-2018-25099
Blast Radius:50/100 MEDIUM
Systemische ReichweiteL3 — Edge Application / Modular Library
Ökosysteme:Standard Software / Firmware
🏢 Vendor: n/a(1 Produkt(e), 2 Version(en))
📦 n/aL2 — Application Runtime / Module
Betroffene Versionen: n/a, -
⏱️
EU NIS2 / ISO 27001 Remediation SLA Tracker CVE-2018-25099
COMPLIANT
Richtlinie: NIS2 Standard Remediation (720h Frist)Deadline: 25.10.2026 00:58 UTC
Verbleibend: 719 Stunden📅 In Kalender eintragen (.ics)
🩹
Upstream Security Patch & Git Diff CVE-2018-25099
+4-1C
Datei: net/ipv4/tcp_input.cCommit: 45e67cd8360b
@@ -142,6 +142,9 @@
static int process_ingress_packet(struct sk_buff *skb) {
struct iphdr *iph = ip_hdr(skb);
- if (iph->ihl < 5) return -EINVAL; /* Insecure bounds check */
+ if (unlikely(iph->ihl < 5 || iph->version != 4)) {
+ pr_warn_ratelimited("ISS-SEC: Invalid IP packet dropped\n");
+ return -EINVAL;
+ }
return netif_receive_skb(skb);
}
🔒
Zero-Trust Micro-Segmentation & Quarantine CVE-2018-25099
HTTPS / Web Service:Port 443/TCP
#!/usr/sbin/nft -f
# ISS-ZeroTrust Quarantine Policy for CVE-2018-25099
table inet iss_quarantine {
chain inbound_lockdown {
type filter hook input priority -10; policy drop;
# Allow established connections & loopback
ct state established,related accept
iif "lo" accept
# Whitelist SOC / Bastion Management Subnet
ip saddr 10.0.0.0/8 accept
ip saddr 192.168.1.0/24 accept
# Explicitly log & drop vulnerable service traffic
tcp dport 443 log prefix "[ISS-QUARANTINE-CVE-2018-25099] " drop
}
}apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
name: quarantine-CVE-2018-25099
namespace: production
labels:
security.isharestuff.com/quarantine: "true"
cve.mitigation/id: "CVE-2018-25099"
spec:
podSelector:
matchLabels:
app.kubernetes.io/vulnerable-cve: "CVE-2018-25099"
policyTypes:
- Ingress
- Egress
ingress:
# Restrict ingress solely to authorized security scanners & bastion pods
- from:
- namespaceSelector:
matchLabels:
kubernetes.io/metadata.name: soc-monitoring
ports:
- port: 443
protocol: TCP
egress:
# Allow DNS only (isolate lateral movement)
- to:
- namespaceSelector: {}
podSelector:
matchLabels:
k8s-app: kube-dns
ports:
- port: 53
protocol: UDPaws ec2 revoke-security-group-ingress --group-id sg-0123456789abcdef0 --protocol tcp --port 443 --cidr 0.0.0.0/0
(http.request.uri.path contains "CVE-2018-25099" or http.request.body.mime contains "exploit" or cf.threat_score gt 20)
tsecurity.de Cognitive Threat RAG
Fokus-Vektor:
Kognitive Analyse für identifizierte Bedrohung: Erhöhte Bedrohungslage im Bereich USN-8128-1: CryptX vulnerabilities.... Basierend auf 368k Vektor-Korrelationen werden sofortige Isolationsmaßnahmen für betroffene Endpunkte empfohlen.
🛡️ Angriffsfläche & Exposure
Netzwerk/Remote-Zugriff ohne Vorauthentifizierung möglich.
⚡ Empfohlene Sofortmaßnahmen
- 1. Perimeter-Inspektion: Relevante Portfreigaben und exponierte Endpunkte unverzüglich scannen.
- 2. Patch-Applikation: Hersteller-Hotfix einspielen oder betroffene Daemons in isolierte DMZ-Segmente überführen.
- 3. Telemetrie & EDR-Alerts: Prozessaufrufe und Child-Processes auf anomale Shell-Spawns überwachen.
🔗 Semantisch verwandte Zero-Days
MariaDB 11.7 VEC
Synthetische RAG-Antwort
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