Last Week in Security - 2020-02-17


Last Week in Security now features MITRE ATT&CK technique links in brackets where appropriate.

News

  • The US Attorney General indicted four suspected Chinese PLA members for the Equifax breach in 2017. The indictment states that the attackers wiped log files daily and routed traffic through dozens of servers in n early 20 countries. Of note, one photo appears to be from a laptop camera, which indicates a possible "hack back" operation or potentially prior access by US intelligence.

  • CIA and BND (German CIA+NSA) owned and subverted the Swiss cryptography company Crypto AG from 1970 to 2018. Supply chain risk just got another poster child. Alex Stamos (former Yahoo/Facebook security exec) shared the time a Hardware Security Module (HSM) was... tampered with prior to delivery. Still not scared of Huawei? Hmm? [T1195]

  • @_dirkjan, the AD whisperer, revealed that CVE-2020-0665 was patched on Tuesday and is able to use "kerberos magic" to bypass forest security boundaries. More to come in April. Note this is unrelated to @harmj0y's forest trust research. [TA0008]

  • Security Key News

  • Google open sources titan security key firmware as OpenSK, a rust application for TockOS running on a Nordic nRF52840 dongle.

  • snopf is a new open source USB "password tool" that works differently than a Yubikey or Google's Titan. It generates a password from a master seed based on parameters passed to it and emulates a keyboard to input the password when a physical button is pressed.

  • @Fox0x01 is back at it! Understanding trusted execution environments and ARM TrustZone is a great resource on how Trusted Execution Environments work on modern Android phones and their attack surface.

  • The Joshua Schulte trial (accused leaker of CIA tools "Vault 7") is underway and already contains some OPSEC fails. It appears Joshua downloaded TAILS and searched for disk wiping and MD5 sum utilities right after a USB was delivered from Amazon. Multiple levels of fail here, but if you buy a book on hiding bodies the day your spouse goes missing, the jury doesn't need to see the body to think you did it... [T1488]

  • unc0ver 4.0.1 is out, with support for iOS 13.1-13.3 on A12 and A13 (iPhone XS series, 11, and 11 Pro). This is the first time these devices have been supported by a jailbreak tool as checkra1n only supports i-devices up to the iPhone X. [T1068]

  • ImageMonkey, an open source repository of classified and tagged images, just surpassed 100,000 images. It is all available for free and even has an API. If you are doing any ML classification training involving images (or just learning ML and need data sets) this is a great resource.

  • US Cert has released 7 new detailed malware reports on DPRK malware, as well as releasing samples via Virus Total. These reports include code snippets on decoding C2 traffic and yara rules in addition to standard IOCs.

Techniques

Tools and Exploits

  • VirusTotal releases an official Plugin for IDA Pro 7. It enables you to search for bytes, strings, similar code, or similar functions against the worlds largest collection of binaries to help your analysis. Standard VT licenses allow 90 days retrospection and Threat Hunter PRO allows for 1 year retrospection. [T1140]

  • Hashcat can now crack zip files using PKZIP at an insane rate of 22.7 ZettaHash/s on a single 2080Ti. Any PKZIP password shorter than 20 characters is not safe.

  • Bloodhound 3.0 released! Slides and Demos are available, as is a companion blog. Updates below. [T1482]

  • Powershell Remoting (port 5985/5986).

  • Control of Group Managed Service Account. Allows reading of plaintext password remotely by authorized principles

  • GMSAPasswordReader

  • Defenders audit DC permission with BloodHound and look for event ID 2947 in the Direct Service log to detect this technique

  • SID History - This is the property used for Golden Ticket attacks, now visible in BloodHound 3.0

  • OU Control - Adds the ability to push ACEs to OUs

  • SharpHound total rewrite (based on .NET 4.5) that gives ~30% faster LDAP collection (600k computers in a few hours!), better caching, and more accurate data collection

  • Various quality of life improvements: large graph drawing warning, improved dark mode, improved node data display, etc

  • During the webinar, the BloodHound team mentioned this great BloodHound Cypher cheatsheet for common queries

  • Best detection is to find "loud LDAP talkers" because the collection of lots of LDAP data is a primitive that cannot be changed for BloodHound to work

  • Mimikatz was updated last week to dump creds from Chrome, and it also works with the new Edge beta (Chromium based). [T1503]

  • Windows Local Privilege Elevation Exploits. Is anyone not SYSTEM at this point? It seems like a new LPE is dropped every day! [T1068]

  • CVE-2020-0683 - Windows MSI “Installer service” Elevation of Privilege. This was patched on tuesday, but (surprise) another symbolic link handling bug, this time within MSI packages being installed, allowed an unprivileged attacker to write to arbitrary files. Like all LPEs this requires code to already be executing on the target, but looks like a nice solid LPE for the new year.

  • itm4n's writeup

  • PoC

  • Weaponization: implement the PoC in C# and run a DLL with UsoDllLoader, then clean up.

  • Generic Detection: Alert on file creation or symlinking of C:\windows\system32\WindowsCoreDeviceInfo.dll

  • Local Privilege Escalation in many Ricoh Printer Drivers for Windows (CVE-2019-19363) disclosed by pentagrid. If you are on a windows box, look for anything with PCL6 in the driver name and you can likely get SYSTEM.

  • Writeup and PoC

  • List of affected drivers

  • AMD User Experience Program Launcher from Radeon Software is vulnerable to an insecure file move which leads to LPE

  • Writeup

  • PoC (amd_eop_poc)

  • Vulnerable Versions: AUEPLauncher (<= 1.0.0.1), AUEPMaster (<= 1950.15.1.117)

  • Weaponization: Same as CVE-2020-0683, C# version that can be run in memory and only drop the WindowsCoreDeviceInfo.dll to disk

  • Generic Detection: Alert on file creation or symlinking of C:\windows\system32\WindowsCoreDeviceInfo.dll

  • PrivescCheck is a fresh PowerShell v2 script that aims to be a dependency free yet feature filled Windows privesc checker.

  • Inspired by Orange Tsai's SSL VPN research, @plopz0r found 6 (!) vulnerabilities in SonicWall devices, including 3 pre-auth (SQLi for authenticated sessions, a classic buffer overflow, and a path traversal [existence only]). Patch your SonicWalls! [T1133]

  • KDU is a seriously impressive project that abstracts away the hard part of getting kernel execution on windows by leveraging vulnerable drivers that are compiled into a single executable. It works on everything from Windows 7 to Windows 10 20H2, even with SecureBoot enabled. It wouldn't be hard to take this project and weaponize it, especially if you have a driver 0day on your hands. Top marks to hfiref0x. [T1068]

  • This joins dsepatch, another driver signing enforcement cradle and gdrv-loader from last week, but dsepatch requires you provide your own vulnerable driver.

  • xgo: Cross compiling Go (golang) is easy in theory, but as soon as you start extending Go with C-based languages or modules, things get complicated. xgo makes building a go project for all targets as easy as xgo github.com/[user]/[go-project]

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