What other package managers are vulnerable to typo squatting attacks?

Posted on Do 30 Juni 2016 in Security • Tagged with security, Typosquatting, nuget, cargoLeave a comment

In my last blog post about typosquatting package managers I discussed my findings about attacking the programming language package managers from rubygems.org, PyPi and npmjs.com.

This blog contribution generated quite some interest and people subsequently asked themselves whether other package managers might also be vulnerable to this hybrid attack (typosquatting involves a technical and psychological attack vector). During the time I wrote my thesis, I encountered some other package managers. A very good overview of some of the most recent package managers gives the github showcase page about ...

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Typosquatting programming language package managers

Posted on Mi 08 Juni 2016 in Security • Tagged with PyPi, Npmjs.com, rubygems.org, security, TyposquattingLeave a comment

Edit: It seems that the blog post and the thesis caused quite some interest. Please contact me under the following mail address, since my mail server on this VPS is constantly down :/ tschachn [|[at]|] hu-berlin [[|dot|]] de

In this blog post I will show how to use the neat JavaScript library chart.js with the well-known Python web-framework Django. As a sample data set I will make use of my workout progress data between May 2016 and August 2016.

  • 17000 computers were forced to execute arbitrary code by typosquatting programming ...
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Nebula Wargame walkthrough Level 10-19

Posted on Di 29 September 2015 in Wargames • Tagged with Linux, Programming, Security, Problem SolvingLeave a comment

Walkthrough of nebula wargame from level 10 to level 19

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Nebula Wargame walkthrough Level 0-9

Posted on Mo 28 September 2015 in Wargames • Tagged with Linux, Programming, Security, Problem SolvingLeave a comment

In this blog post we will walk through the solutions of the levels 0 to 9 of the Nebula wargame, which is hosted on http://exploit-exercises.com. This writeup will force me to memorize commands better and exercise a bit. I fear that this writeup is of no use for other people, since you hopefully want to solve those exercises on your own :)

Level 0 - Finding setuid programs in the filesystem

As the descriptions states you need to find a setuid binary that gets a shell for the flag00 user ...

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Solution for wargame natas19

Posted on Di 15 September 2015 in Php • Tagged with Python, Wargames, Php, SecurityLeave a comment

Hi everyone

I am still trying to solve wargames on overthewire. Level 19 proofed to be very similar to level 18, where server side code looks something like the following:


$maxid = 640; // 640 should be enough for everyone

function isValidAdminLogin() { /* {{{ */
    if($_REQUEST["username"] == "admin") {
    /* This method of authentication appears to be unsafe and has been disabled for now. */
        //return 1;

    return 0;
/* }}} */
function isValidID($id) { /* {{{ */
    return is_numeric($id);
/* }}} */
function createID($user) { /* {{{ */
    global $maxid;
    return rand(1, $maxid);
/* }}} */
function debug($msg) { /* {{{ */
    if(array_key_exists("debug", $_GET)) {
        print "DEBUG: $msg";
/* }}} */
function my_session_start() { /* {{{ */
    if ...
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Solution for Natas11 for natas wargame on overthewire.org

Posted on Do 10 September 2015 in Php • Tagged with Wargames, Php, Programming, SecurityLeave a comment

Solution for Natas web security wargame with by XORing the plaintext with the ciphertext...

Currently I am playing some wargames on overthewire.org.

The first 10 levels were very easy and everyone with some technical knowledge and programming experience should be able to solve them. But somehow I got stuck for a few hours on level 11. The task is to modify a XOR encrypted cookie. For some reason I couldn't figure out how to obtain the xor key that was used.

The challenge was to reverse engineer the ...

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