Convention Wi-Fi networks are a chaotic setting the place 1000’s of units, every with their very own historical past and configuration, converge and join.
A standard problem is that attendees’ laptops and different units, configured for ‘safer’ dwelling or company environments, usually join to those convention networks with an implicit stage of belief. This exposes delicate secrets and techniques, which an opportunistic attacker can exploit.
The Safety Operations Centre (SOC) at Cisco Reside Melbourne is on the frontlines of this problem. To successfully shield the community and educate attendees, our analysts have to quickly perceive the torrent of knowledge flowing by our programs. We leverage highly effective instruments like Endace, which supplies us with invaluable full packet seize capabilities, providing a deep, granular view of each byte traversing the community. Nevertheless, uncooked packet information, whereas complete, is an unorganized library. It’s with instruments like Splunk Enterprise Safety that we are able to actually extract worth.
Fast Orientation with Splunk’s subject abstractÂ
One of many easiest methods we speed up understanding of latest logs is by utilizing Splunk Processing Language (SPL) instructions designed to profile information shortly. The fieldsummary command is especially efficient: it analyzes a dataset for out there fields, information varieties, cardinality, and null charges, giving analysts a quick and clear image of probably the most priceless fields in an information set.
Typical move: Ingest a brand new supply, search for fascinating fields after which run fieldsummary on them to disclose their most notable values, then pivot to focused searches and dashboards tailor-made to the dataset’s most informative attributes.
Instance SPL to shortly profile a brand new index:
index=se_network_endace ```comprises all endace packet occasion logs```
| fieldsummary service path proto app motion ```spotlight fields that may include fascinating values```Can you notice the protocols that may curiosity an attacker? Whereas there are fairly a couple of, this weblog will give attention to a handful.
Pivot: HTTP Authorization Headers and OAuth 2.0
With the information higher understood, we are able to pivot to HTTP visitors that included Authorization headers. Fashionable net authentication closely depends on TLS to guard secrets and techniques in transit, so it was very disappointing to see the amount of plain HTTP authentication.
Endace’s full packet seize was vital for exact reconstruction of classes and headers for validation. Packet-level proof confirmed that the noticed Authorization scheme aligned with OAuth 2.0 patterns, generally seen as Bearer and Refresh tokens. Anybody who obtains Bearer or Refresh tokens can entry the assets these tokens grant till they expire or are revoked.
Why TLS is non-negotiable: OAuth 2.0 depends on Transport Layer Safety (TLS) to guard secrets and techniques over the wire. With out sturdy, appropriately configured TLS, credentials and tokens despatched in headers are uncovered in transit.
Pivot: Uncommon Kerberos Exercise on a Convention Community
One other notable commentary was the presence of Kerberos exercise on the visitor community. Kerberos is a broadly deployed authentication protocol sometimes discovered on inner enterprise networks (generally inside Lively Listing domains). Kerberos makes use of a trusted Key Distribution Middle (KDC) to problem time-bound tickets that show identification securely with out repeatedly sending passwords. Shoppers receive a Ticket-Granting Ticket (TGT) from the KDC, then request service tickets to entry particular person providers. These tickets are cryptographically protected and time-limited. In attackers’ arms, a Kerberos ticket might be leveraged to realize unauthorized entry, transfer laterally throughout the community, or escalate privileges by impersonating reputable customers, making its detection on the community enticing for attackers.
Why Kerberos visitors issues to defenders:
- Secret Publicity: Kerberos on a transient, public community can point out units carrying company configurations right into a convention setting, which can leak weakly encrypted secrets and techniques/passwords unintended for public networks.
- Public-facing KDC: Utilization of Kerberos on the web suggests a public-facing KDC (probably additionally a Area Controller) which is a pretty goal for attackers.
Frequent assault surfaces to concentrate on (high-level consciousness for defenders):
- Ticket Replay and Impersonation Makes an attempt: Reuse of legitimate tickets inside their lifetime window to impersonate a reputable consumer or service.
- Weak or Misconfigured Encryption: Use of deprecated ciphers or configurations that allow downgrade, interception, or decryption of tickets.
- Kerberoasting: An attacker with a legitimate ticket can request service tickets from the KDC that are encrypted with the service account password. If the password is weak, it may be decrypted.
- Time Skew and Validation Gaps: Unsynchronized clocks or lax validation could make replay and ticket acceptance extra probably.
The Energy of the Ecosystem
The Cisco Reside SOC exemplified how a contemporary safety ecosystem amplifies every element’s strengths whereas enabling deeper dives when warranted. Every platform contributed distinctive visibility and proof, and every linked again to its native interfaces for expert-level evaluation.
- Splunk: Fast orientation with fieldsummary and quick pivots to hunts throughout numerous telemetry. Superb for correlation, dashboards, and automation hooks.
- Endace: Packet-level reality on demand. PCAP confirmed protocol semantics, reconstructed headers, and validated behaviors that logs alone couldn’t conclusively show.
- Cisco XDR: Cross-signal correlation and incident administration spanning Safe Firewall, Safe Entry (DNS), Safe Community Analytics, and companion telemetry. Diminished swivel-chair evaluation and tightened response loops.
- Safe Firewall and Safe Entry: Inline enforcement and DNS-layer perception, turning detection into motion whereas feeding again wealthy logs for investigation.
- Safe Community Analytics: NetFlow analytics to floor scanning, beaconing, and anomalous connection patterns at scale.
Collectively, the ecosystem shortened each detection and response instances. Analysts might begin with SPL summaries, escalate to correlation in XDR, and shut the loop with packet proof in Endace.
Take a look at the opposite blogs by my colleagues within the Cisco Reside Melbourne 2026 SOC.
We’d love to listen to what you assume! Ask a query and keep related with Cisco Safety on social media.
Cisco Safety Social Media
