FUN WITH LINUX

HackADay: A Christmas-Machine(Merry Christmas)

21 December 2019

This year I want to send you merry christmas by creating a blog-entry for a raspberry pi christmas project. The “christmas-machine” displays merry christmas and wishes for the “christkind” on a tft display for the raspberry. It is possible to send christmas wishes using a web applications that can be accessed via wifi. I placed this installation at the coffee-kitchen in the office and it was very nice to see that my colleges had a lot of fun with it.

Blesses for “Brother Patrick” who spent me that wonderful Joy-IT TFT display.

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BSides 2019: Code diving for pop chains

11 December 2019

bsides vienna 2019 talk

I gave a talk at the BSides 2019 Vienna about PHP Object Injection. Here is the abstract of this talk:

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OkayCMS: Unauthenticated remote code execution

2 December 2019

Identifier: AIT-SA-20191129-01
Target: OkayCMS
Vendor: OkayCMS
Version: all versions including 2.3.4
CVE: CVE-2019-16885
Accessibility: Local
Severity: Critical
Author: Wolfgang Hotwagner (AIT Austrian Institute of Technology)

Summary

OkayCMS is a simple and functional content managment system for an online store.

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FreeRadius: Privilege Escalation via Logrotate

2 December 2019

Identifier: AIT-SA-20191112-01

Target: FreeRadius
Vendor: FreeRadius
Version: all versions including 3.0.19
Fixed in Version: 12.2.3, 12.1.8 and 12.0.8
CVE: CVE-2019-10143
Accessibility: Local
Severity: Low
Author: Wolfgang Hotwagner (AIT Austrian Institute of Technology)

Summary

FreeRadius is a modular Open-Source RADIUS suite.

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Fifth Anniversary

7 November 2019

I started this blog five years ago. In the beginning I wrote mostly articles about sysadmin and programming. Now its also filled with security related stuff. It’s fascinating for me to have a history of my interests. It’s sadly that my spare time got rare and so it happens that I don’t write much lately. My intention for the next 5 years is, to be more consequent with writing articles.

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CVE-2019-15741: Privilege Escalation via Logrotate in Gitlab Omnibus

4 October 2019

Overview

  • Identifier: AIT-SA-20190930-01
  • Target: GitLab Omnibus
  • Vendor: GitLab
  • Version: 7.4 through 12.2.1
  • Fixed in Version: 12.2.3, 12.1.8 and 12.0.8
  • CVE: CVE-2019-15741
  • Accessibility: Local
  • Severity: Low
  • Author: Wolfgang Hotwagner (AIT Austrian Institute of Technology)

Vulnerability Description

GitLab Omnibus sets the ownership of the log directory to the system-user “git”, which might let local users obtain root access because of unsafe interaction with logrotate.

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Privilege escalation in groonga-httpd (CVE-2019-11675)

7 May 2019

Overview

  • System affected: Debian packages of groonga/-httpd 6.1.5-1
  • Software-Version: 6.1.5-1
  • User-Interaction: Not required
  • Impact: Local root
  • CVE: CVE-2019-11675
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Anatomy of a Linux container rootkit

7 May 2019

This year I gave a talk at the Easterhegg 2019 about a Linux kernel rootkit that can handle containers. I mainly presented my Bachelor work from 2017 with some improvements.

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Details of a logrotate race-condition

1 May 2019

Logrotate is prone to a race-condition on systems with a log directory that is in control of a low privileged user. A malicious user could trick logrotate to create files in any directory if it is executed as root. This might lead into a privileged escalation.

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