Serverless at the Edge: Enabling Magical Unicorns

Before we dive straight into the magical unicorn from heaven that is serverless computing embedded within the CDN edge a direct customer quote that I want on a team T-shirt soon, let's first level-set on some basic concepts of computing. In the context of web experiences, IoT device messaging, an...

Rbcd-Attack - Kerberos Resource-Based Constrained Delegation Attack From Outside Using Impacket

Abusing Kerberos Resource-Based Constrained Delegation TL;DR This repo is about a practical attack against Kerberos Resource-Based Constrained Delegation in a Windows Active Directory Domain. The difference from other common implementations is that we are launching the attack from outside of the...

Internet Bug Bounty: Exim handles BDAT data incorrectly and leads to crash/hang

Original article is here Incorrect BDAT data handling leads to DoS Vulnerability Analysis When receiving data with BDAT command, SMTP server should not consider a single dot ‘.’ in a line to be the end of message. However, we found exim does in receivemsg when parsing header. Like the following...

Exim 4.89 - BDAT Denial of Service

Exim 4.89 - BDAT Denial of Service While parsing BDAT data header, exim still scans for '.' and consider it the end of mail. https://github.com/Exim/exim/blob/master/src/src/receive.cL1867 Exim goes into an incorrect state after this message is sent because the function pointer receivegetc is not...

Exim 4.89 - 'BDAT' Denial of Service

While parsing BDAT data header, exim still scans for '.' and consider it the end of mail. https://github.com/Exim/exim/blob/master/src/src/receive.cL1867 Exim goes into an incorrect state after this message is sent because the function pointer receivegetc is not reset. If the following command is...

Exim 4.89 - BDAT Denial of Service Exploit

Exploit for multiple platform in category dos / poc While parsing BDAT data header, exim still scans for '.' and consider it the end of mail. https://github.com/Exim/exim/blob/master/src/src/receive.cL1867 Exim goes into an incorrect state after this message is sent because the function pointer...