Bug Bytes #141 – Sesh Gremlin attack, RCE via password field & Pwning XMLSec for info disclosure and bounties

By Anna Hammond

October 6, 2021

Bug Bytes is a weekly newsletter curated by members of the bug bounty community. The first series is curated by Mariem, better known as PentesterLand. Every week, she keeps us up to date with a comprehensive list of write-ups, tools, tutorials and resources.


This issue covers the week from September 27 to October 4.

Intigriti news

Always wanted to be part of an @intigriti live hacking event? Now is your chance!

Everybody can win a 40€ swag voucher (King of the Hill 102021)

Our favorite 5 hacking items

1. Video of the week

Bug Bounty | $2000 for SSRF bypass using DNS rebinding & Lab

If you want to practice SSRF or DNS rebinding attacks, this is a great resource. “Leet Cipher” shares details of an SSRF bypass via DNS rebinding found in a bug bounty program. The lab provided reproduces the issue and is easy to deploy using Docker. Make sure to try first before watching the solution!

2. Writeups of the week

Ping’ing XMLSec
Cisco Hyperflex: How We Got RCE Through Login Form and Other Findings

The first writeup is about an ingenious attack chain involving XSLT and XXE that @_tint0 discovered in PingFederate. Pwning this popular SSO product led to critical information disclosure bugs on many programs and bounties from Netflix, Paypal, Ping, etc.

The second writeup by @Ankorik and @__mn1__ relates (among other vulnerabilities) an interesting RCE via password field in Cisco HyperFlex.

3. Tip of the week

“Sesh Gremlin” attack

@SlandailLtd shared an interesting excerpt from a pentest report on what they call a “Sesh Gremlin” attack. The idea is to keep an eye on all endpoints that return a session cookie, then re-use each cookie collected to access authenticated areas.

4. Resource of the week

Burp Suite documentation

The official Burp documentation was recently updated and is worth the detour. It includes extensive details on generic Burp usage, all the features including advanced ones you may not know about, how to use the tool for penetration testing or mobile testing, and more.

5. Conference of the week

BSides Berlin 2021

This conference includes many interesting talks on all kinds of topics such as attacking cookie-based authentication or webinar platforms. I especially recommend the keynote by @niemand_sec. He shares some bug examples and the approach/mindset used to find them, the types of questions he asks himself when doing research or when reading writeups.


Other amazing things we stumbled upon this week





Slides & Workshop material



Challenge writeups

Pentest writeups

Responsible(ish) disclosure writeups

0-day & N-day vulnerabilities

Bug bounty writeups

See more writeups on The list of bug bounty writeups.


  • Mariana Trench: Facebook’s security focused static analysis tool for Android and Java applications

  • Certgraph & Intro: An open source intelligence tool to crawl the graph of certificate Alternate Names

  • GitOops!: A tool to help attackers and defenders identify lateral movement and privilege escalation paths in GitHub organizations by abusing CI/CD pipelines and GitHub access controls (Inspired from Bloodhound and Cartography)

  • interactsh-web: Web Client for Interactsh

  • Gowap: Wappalyzer implementation in Go

  • DonPAPI: Dumping DPAPI credz remotely

  • Weggli & Difference with CodeQL: A fast and robust semantic search tool for C and C++ codebases. It is designed to help security researchers identify interesting functionality in large codebases

Tips & Tweets

Misc. pentest & bug bounty resources



Bug bounty & Pentest news

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