jboner

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

oXnMe

isolation.tools.getPtrLocation.disable = "TRUE" 
isolation.tools.setPtrLocation.disable = "TRUE" 
isolation.tools.setVersion.disable = "TRUE" 
isolation.tools.getVersion.disable = "TRUE" 
monitor_control.disable_directexec = "TRUE" 
monitor_control.disable_chksimd = "TRUE" 
monitor_control.disable_ntreloc = "TRUE" 
monitor_control.disable_selfmod = "TRUE" 
monitor_control.disable_reloc = "TRUE" 
monitor_control.disable_btinout = "TRUE" 

LoadLow

This is based on https://hugeh0ge.github.io/2019/11/04/Getting-Arbitrary-Code-Execution-from-fopen-s-2nd-Argument/

Credits: @hugeh0ge

It uses iconv, in php, in order to execute the same payload.

Uses cases :

• You control the first parameter of iconv (in_charset), you can set an env var and you can upload arbitrary files (.so library file and the gconv-modules file) and you know their path.
• You have a php RCE but system, shell_exec, curl_exec and other functions are disabled but you can setenv (and LD_PRELOAD is blacklisted).

hkraw

class Helpers {

 constructor() {
  this.cvt_buf = new ArrayBuffer(8);
  this.cvt_f64a = new Float64Array(this.cvt_buf);
  this.cvt_u64a = new BigUint64Array(this.cvt_buf);
  this.cvt_u32a = new Uint32Array(this.cvt_buf);
 }

 ftoi(f) {

orangetw

<?php
    if (!isset($_GET['mail']))
        highlight_file(__FILE__) && exit();

    $mail    = filter_var($_GET['mail'],           FILTER_VALIDATE_EMAIL);
    $addr    = filter_var($_SERVER['REMOTE_ADDR'], FILTER_VALIDATE_IP);
    $country = geoip_country_code_by_name($addr);
    
    if (!$addr    || strlen($addr)    == 0) die('bad addr');
    if (!$mail    || strlen($mail)    == 0) die('bad mail');

OrionReed

// 3D Dom viewer, copy-paste this into your console to visualise the DOM as a stack of solid blocks.
// You can also minify and save it as a bookmarklet (https://www.freecodecamp.org/news/what-are-bookmarklets/)
(() => {
  const SHOW_SIDES = false; // color sides of DOM nodes?
  const COLOR_SURFACE = true; // color tops of DOM nodes?
  const COLOR_RANDOM = false; // randomise color?
  const COLOR_HUE = 190; // hue in HSL (https://hslpicker.com)
  const MAX_ROTATION = 180; // set to 360 to rotate all the way round
  const THICKNESS = 20; // thickness of layers
  const DISTANCE = 10000; // ¯\\_(ツ)_/¯

thesamesam

FAQ on the xz-utils backdoor (CVE-2024-3094)

This is a living document. Everything in this document is made in good faith of being accurate, but like I just said; we don't yet know everything about what's going on.

Background

On March 29th, 2024, a backdoor was discovered in xz-utils, a suite of software that

smx-smx

XZ Backdoor symbol deobfuscation. Updated as i make progress