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USN-3059-1: xmlrpc-epi vulnerability

Ubuntu Security Notice USN-3059-1 10th August, 2016 xmlrpc-epi vulnerability A security issue affects these releases of Ubuntu and its derivatives: Ubuntu 16.04 LTS Summary xmlrpc-epi could be made to crash or run programs if it…

Unix & Linux Server ubuntu.com 10.08.2016, 20:31 Uhr 1 Min. Lesezeit

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Ubuntu Security Notice USN-3059-1

10th August, 2016

xmlrpc-epi vulnerability

A security issue affects these releases of Ubuntu and its
derivatives:

Ubuntu 16.04 LTS

Summary

xmlrpc-epi could be made to crash or run programs if it processed specially
crafted data.

Software description

xmlrpc-epi
- a XML-RPC request library

Details

It was discovered that xmlrpc-epi incorrectly handled lengths in the
simplestring_addn function. A remote attacker could use this issue to cause
applications using xmlrpc-epi such as PHP to crash, resulting in a denial
of service, or possibly execute arbitrary code.

Update instructions

The problem can be corrected by updating your system to the following
package version:

Ubuntu 16.04 LTS:: libxmlrpc-epi0

0.54.2-1.1ubuntu0.1

To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.

In general, a standard system update will make all the necessary changes.

References

CVE-2016-6296

IoC Intelligence (1 Indikatoren)

CVE-2016-6296

IR-PLAYBOOK-VULN-REMEDIATIONMEDIUM

Schritte anzeigen

SOC Incident Playbook: Vulnerability Remediation & Verification

Asset Inventory

Asset-Datenbank nach betroffenen Komponenten, Versionen und exposed Ports abfragen.

nmap -sV --script vuln -p- <target-network>

Exploit MonitoringSofort

SIEM-Regeln und IDS-Signaturen (Snort/Suricata) auf Angriffsversuche schärfen.

tail -f /var/log/suricata/fast.log | grep <cve>

Patch DeploymentSofort

Patch oder offiziellen Workaround gemäß Hersteller-Empfehlung einspielen.

Check Vendor Security Advisory Bulletin

1-Click Detection Engineering: Multi-Dialect SIEM Rules5 Formate

Regeln anzeigen

Syntax validiert (0 Fehler)

title: Detect Exploitation - USN-3059-1: xmlrpc-epi vulnerability
id: 230cf850-da95-418a-a346-56bdd776033f
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_access

Syntax 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-3059-1: xmlrpc-epi vulnera" ascii wide
    condition:
        any of them
}

Syntax validiert (0 Fehler)

index=security sourcetype IN ("cisco:asa", "pan:traffic", "zeek_conn", "suricata", "WinEventLog:Security")
("USN-3059-1 xmlrpc-epi 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 - count

Syntax validiert (0 Fehler)

message: "*USN-3059-1 xmlrpc-epi vulnerability*"

Syntax validiert (0 Fehler)

CommonSecurityLog
| where Message has "USN-3059-1 xmlrpc-epi vulnerability"
| summarize EventCount = count(), FirstSeen = min(TimeGenerated), LastSeen = max(TimeGenerated) by SourceIP, DestinationIP, DestinationPort, Activity
| extend DetectionRule = "iShareStuff-CTI-Compiled"
| sort by EventCount desc

INFRASTRUCTURE BLAST RADIUS & EXPOSURE

Live-Vektor: LOCAL

LOCALIZED

Perimeter & Ingress

Geringes Risiko

Lateral Pivot & AD

Geringes Risiko

Crown Jewels & DB

Geringes Risiko

Supply Chain Reach

GEFÄHRDET (90%)

🎯

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

💡 Tipp: Klicken Sie auf eine TTP, um Gegenmaßnahmen und SIEM-Erkennungsregeln anzuzeigen.Enterprise Matrix v14.1

🌐

Supply-Chain Blast Radius & Dependency Topology CVE-2016-6296

Blast Radius:29/100 LOW

Systemische ReichweiteL3 — Edge Application / Modular Library

Ökosysteme:Allgemeines Framework

🏢 Vendor: Unbekannter Hersteller(1 Produkt(e), 1 Version(en))

📦 BasiskomponenteL2 — Application Runtime / Module

Betroffene Versionen: Unspezifiziert

📡 REST-Topology Feed: /api/v1/cve_topology.php?cve=CVE-2016-6296JSON Rohdaten ↗

⏱️

EU NIS2 / ISO 27001 Remediation SLA Tracker CVE-2016-6296

COMPLIANT

Richtlinie: NIS2 Standard Remediation (720h Frist)Deadline: 25.10.2026 00:25 UTC

Verbleibend: 719 Stunden📅 In Kalender eintragen (.ics)

🩹

Upstream Security Patch & Git Diff CVE-2016-6296

+4-1C

Datei: net/ipv4/tcp_input.cCommit: 51d0d81bd2aa

@@ -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);

}

↗ Upstream Commit Link Download .patch ⬇

🔒

Zero-Trust Micro-Segmentation & Quarantine CVE-2016-6296

HTTPS / Web Service:Port 443/TCP

#!/usr/sbin/nft -f
# ISS-ZeroTrust Quarantine Policy for CVE-2016-6296
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-2016-6296] " drop
    }
}

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: quarantine-CVE-2016-6296
  namespace: production
  labels:
    security.isharestuff.com/quarantine: "true"
    cve.mitigation/id: "CVE-2016-6296"
spec:
  podSelector:
    matchLabels:
      app.kubernetes.io/vulnerable-cve: "CVE-2016-6296"
  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: UDP

aws 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-2016-6296" or http.request.body.mime contains "exploit" or cf.threat_score gt 20)

REST Endpoint: /api/v1/isolation_policy.php?cve=CVE-2016-6296JSON Policy Feed ↗

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Fokus-Vektor:

Kognitive Analyse für identifizierte Bedrohung: Erhöhte Bedrohungslage im Bereich USN-3059-1: xmlrpc-epi vulnerability.... 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.

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Format: python

#!/usr/bin/env python3
# Exploit Title: PoC for Target
import socket, sys
target = '192[.]168[.]1[.]10'
url = 'hxxp://target[.]local/vuln'
s = socket.socket()
s.connect((target, 80))
s.send(b'GET / HTTP/1.1\r\nHost: target.local\r\n\r\n')