It was discovered that ncurses incorrectly handled certain terminfo
entries in the infocmp tool. An attacker could possibly use this issue
to cause a denial of service via a crafted terminfo file.
The default compiler options for affected releases should reduce the
vulnerability to a denial of service.
Intelligence View
⚡ tsecurity.de Intelligence
USN-8503-1: ncurses vulnerability
It was discovered that ncurses incorrectly handled certain terminfo entries in the infocmp tool. An attacker could possibly use this issue to cause a denial of service via a crafted terminfo file. The default compiler options for affected…
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1-Click Detection Engineering: Multi-Dialect SIEM Rules5 Formate
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Syntax validiert (0 Fehler)
title: Detect Exploitation - USN-8503-1: ncurses vulnerability
id: 8dced550-9249-4e98-b3b2-70a07c613b85
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-8503-1: ncurses vulnerabil" ascii wide
condition:
any of them
}Syntax validiert (0 Fehler)
index=security sourcetype IN ("cisco:asa", "pan:traffic", "zeek_conn", "suricata", "WinEventLog:Security")
("USN-8503-1 ncurses vulnerability")
| 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-8503-1 ncurses vulnerability*"Syntax validiert (0 Fehler)
CommonSecurityLog
| where Message has "USN-8503-1 ncurses vulnerability"
| summarize EventCount = count(), FirstSeen = min(TimeGenerated), LastSeen = max(TimeGenerated) by SourceIP, DestinationIP, DestinationPort, Activity
| extend DetectionRule = "iShareStuff-CTI-Compiled"
| sort by EventCount desc2. Cyber Threat Intelligence & Forensik
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Reconnaissance
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Resource Development
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Persistence
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Privilege Escalation
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Discovery
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Collection
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Command and Control
Exfiltration
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Impact
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Fokus-Vektor:
Kognitive Analyse für identifizierte Bedrohung: Erhöhte Bedrohungslage im Bereich USN-8503-1: ncurses vulnerability.... Basierend auf 368k Vektor-Korrelationen werden sofortige Isolationsmaßnahmen für betroffene Endpunkte empfohlen.
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