www.bleepingcomputer.com
Open in
urlscan Pro
104.20.60.209
Public Scan
Submitted URL: https://ift.tt/3dE8Xv8
Effective URL: https://www.bleepingcomputer.com/news/security/researchers-release-vaccine-for-critical-log4shell-vulnerability/
Submission: On December 11 via api from US — Scanned from DE
Effective URL: https://www.bleepingcomputer.com/news/security/researchers-release-vaccine-for-critical-log4shell-vulnerability/
Submission: On December 11 via api from US — Scanned from DE
Form analysis 6 forms found in the DOM
https://www.bleepingcomputer.com/search/
<form title="Search site" action="https://www.bleepingcomputer.com/search/">
<input type="hidden" name="cx" value="partner-pub-0920899300397823:3529943228">
<input type="hidden" name="cof" value="FORID:10">
<input type="hidden" name="ie" value="UTF-8">
<input type="search" name="q" aria-label="Search Site" placeholder="Search Site">
</form>https://www.bleepingcomputer.com/search/
<form action="https://www.bleepingcomputer.com/search/">
<input type="hidden" name="cx" value="partner-pub-0920899300397823:3529943228">
<input type="hidden" name="cof" value="FORID:10">
<input type="hidden" name="ie" value="UTF-8">
<input type="search" name="q" aria-label="Search Site" placeholder="Search Site">
</form>POST //bleepingcomputer.us10.list-manage.com/subscribe/post?u=3e2b3b692f780cdff40d45346&id=30c98e654e
<form action="//bleepingcomputer.us10.list-manage.com/subscribe/post?u=3e2b3b692f780cdff40d45346&id=30c98e654e" method="post" target="_blank" novalidate="">
<input type="email" name="EMAIL" aria-label="Enter email address" placeholder="Email Address...">
<div style="position: absolute; left: -5000px;"><input type="hidden" aria-hidden="true" name="b_3e2b3b692f780cdff40d45346_30c98e654e" tabindex="-1" value=""></div>
<input type="submit" value="Submit" class="bc_sub_btn">
</form>POST //bleepingcomputer.us10.list-manage.com/subscribe/post?u=3e2b3b692f780cdff40d45346&id=30c98e654e
<form action="//bleepingcomputer.us10.list-manage.com/subscribe/post?u=3e2b3b692f780cdff40d45346&id=30c98e654e" method="post" target="_blank" novalidate="">
<input type="email" aria-label="Enter email address" name="EMAIL" placeholder="Email Address...">
<div style="position: absolute; left: -5000px;"><input type="hidden" aria-hidden="true" name="b_3e2b3b692f780cdff40d45346_30c98e654e" tabindex="-1" value=""></div>
<input type="submit" value="Submit" class="bc_sub_btn">
</form>POST https://www.bleepingcomputer.com/forums/index.php?app=core&module=global§ion=login&do=process&return=https://www.bleepingcomputer.com/news/security/researchers-release-vaccine-for-critical-log4shell-vulnerability/
<form action="https://www.bleepingcomputer.com/forums/index.php?app=core&module=global&section=login&do=process&return=https://www.bleepingcomputer.com/news/security/researchers-release-vaccine-for-critical-log4shell-vulnerability/"
method="post">
<div class="bc_form_feild">
<label for="ips_username">Username</label>
<input aria-label="Enter login name" title="Enter login name" type="text" id="ips_username" name="ips_username" autocomplete="username">
</div>
<div class="bc_form_feild">
<label for="ips_password">Password</label>
<input aria-label="Enter login password" title="Enter login passwod" type="password" id="ips_password" name="ips_password" autocomplete="current-password">
</div>
<div class="bc_form_feild">
<div class="bc_remember">
<input id="remember" type="checkbox" name="rememberMe" value="1" checked="checked">
<label for="remember">Remember Me</label>
</div>
<div class="bc_anon">
<input id="anonymous" type="checkbox" name="anonymous" value="1">
<label for="anonymous">Sign in anonymously</label>
</div>
</div>
<div class="bc_btn_wrap">
<input type="hidden" name="auth_key" value="880ea6a14ea49e853634fbdc5015a024">
<input type="submit" aria-label="Login to site" title="Login" value="Login" class="bc_sub_btn">
<a aria-label="Sign in with Twitter" href="https://www.bleepingcomputer.com/forums/index.php?app=core&module=global&section=login&serviceClick=twitter&return=https://www.bleepingcomputer.com/news/security/researchers-release-vaccine-for-critical-log4shell-vulnerability/" class="bc_twitter_btn"><img src="https://www.bleepstatic.com/images/site/login/twitter.png" width="28" height="24" alt="Sign in with Twitter button"> Sign in with Twitter</a>
<hr>
<p>Not a member yet? <a aria-label="Register account" title="Register account" href="https://www.bleepingcomputer.com/forums/index.php?app=core&module=global&section=register">Register Now</a></p>
</div>
</form><form>
<input type="hidden" id="comment-id-report" value="0">
<ul>
<li>
<label><input type="radio" name="comment-report-reason" value="Spam">Spam</label>
</li>
<li>
<label><input type="radio" name="comment-report-reason" value="Abusive or Harmful">Abusive or Harmful</label>
</li>
<li>
<label><input type="radio" name="comment-report-reason" value="Inappropriate content">Inappropriate content</label>
</li>
<li>
<label><input type="radio" name="comment-report-reason" value="Strong language">Strong language</label>
</li>
<li>
<label><input type="radio" name="comment-report-reason" value="Other">Other</label>
</li>
<li id="comment-report-other-reason-wrap" style="display:none;">
<textarea aria-label="Enter other reason for reporting the comment" rows="2" cols="2" id="comment-report-other-reason"></textarea>
</li>
</ul>
<p>Read our <a href="https://www.bleepingcomputer.com/posting-guidelines/">posting guidelinese</a> to learn what content is prohibited.</p>
</form>Text Content
WE VALUE YOUR PRIVACY
We and our partners store and/or access information on a device, such as cookies
and process personal data, such as unique identifiers and standard information
sent by a device for personalised ads and content, ad and content measurement,
and audience insights, as well as to develop and improve products.
With your permission we and our partners may use precise geolocation data and
identification through device scanning. You may click to consent to our and our
partners’ processing as described above. Alternatively you may access more
detailed information and change your preferences before consenting or to refuse
consenting. Please note that some processing of your personal data may not
require your consent, but you have a right to object to such processing. Your
preferences will apply to this website only. You can change your preferences at
any time by returning to this site or visit our privacy policy.
MORE OPTIONSAGREE
*
*
*
*
*
*
* News
* Featured
* Latest
* New zero-day exploit for Log4j Java library is an enterprise nightmare
* ALPHV BlackCat - This year's most sophisticated ransomware
* Volvo Cars discloses security breach leading to R&D data theft
* Massive attack against 1.6 million WordPress sites underway
* Researchers release 'vaccine' for critical Log4Shell vulnerability
* The Week in Ransomware - December 10th 2021 - Project CODA
* Phishing attacks use QR codes to steal banking credentials
* Volvo Cars discloses security breach leading to R&D data theft
* Downloads
* Latest
* Most Downloaded
* Qualys BrowserCheck
* STOPDecrypter
* AuroraDecrypter
* FilesLockerDecrypter
* AdwCleaner
* ComboFix
* RKill
* Junkware Removal Tool
* Virus Removal Guides
* Latest
* Most Viewed
* Ransomware
* How to remove the PBlock+ adware browser extension
* Remove the Toksearches.xyz Search Redirect
* Remove the Smashapps.net Search Redirect
* Remove the Smashappsearch.com Search Redirect
* Remove Security Tool and SecurityTool (Uninstall Guide)
* How to remove Antivirus 2009 (Uninstall Instructions)
* How to Remove WinFixer / Virtumonde / Msevents / Trojan.vundo
* How to remove Google Redirects or the TDSS, TDL3, or Alureon rootkit using
TDSSKiller
* Locky Ransomware Information, Help Guide, and FAQ
* CryptoLocker Ransomware Information Guide and FAQ
* CryptorBit and HowDecrypt Information Guide and FAQ
* CryptoDefense and How_Decrypt Ransomware Information Guide and FAQ
* Tutorials
* Latest
* Popular
* How to make the Start menu full screen in Windows 10
* How to install the Microsoft Visual C++ 2015 Runtime
* How to open an elevated PowerShell Admin prompt in Windows 10
* How to Translate a Web Page in Google Chrome
* How to start Windows in Safe Mode
* How to remove a Trojan, Virus, Worm, or other Malware
* How to show hidden files in Windows 7
* How to see hidden files in Windows
* Deals
* Categories
* eLearning
* IT Certification Courses
* Gear + Gadgets
* Security
* Forums
* More
* Startup Database
* Uninstall Database
* File Database
* Glossary
* Chat on Discord
* Send us a Tip!
* Welcome Guide
* Home
* News
* Security
* Researchers release 'vaccine' for critical Log4Shell vulnerability
* AddThis Sharing Buttons
Share to FacebookFacebookShare to TwitterTwitterShare to
LinkedInLinkedInShare to RedditRedditShare to Hacker NewsHacker NewsShare to
EmailEmail
*
RESEARCHERS RELEASE 'VACCINE' FOR CRITICAL LOG4SHELL VULNERABILITY
By
LAWRENCE ABRAMS
* December 10, 2021
* 08:58 PM
* 0
Source: Kevin Beaumont
Researchers from cybersecurity firm Cybereason has released a "vaccine" that can
be used to remotely mitigate the critical 'Log4Shell' Apache Log4j code
execution vulnerability running rampant through the Internet.
Apache Log4j is a Java-based logging platform that can be used to analyze web
server access logs or application logs. The software is heavily used in the
enterprise, eCommerce platforms, and games, such as Minecraft who rushed out a
patched version earlier today.
Early this morning, researchers released a proof-of-concept exploit for a
zero-day remote code execution vulnerability in Apache Log4j tracked
as CVE-2021-44228 and dubbed 'Log4Shell.'
While Apache quickly released Log4j 2.15.0 to resolve the vulnerability, the
vulnerability is trivial to exploit, and cybersecurity firms and
researchers quickly saw attackers scan and attempt to compromise vulnerable
devices.
PLAY Top Articles Video Settings Full Screen About Connatix V142093 Read More
Read More Read More Read More Read More The Week in Ransomware ‑ December 10th
2021‑ Project CODA 1/1 Skip Ad Continue watching after the ad Visit Advertiser
website GO TO PAGE
As threat actors can exploit this vulnerability by simply changing their web
browser's user agent and visiting a vulnerable site or searching for that string
on a site, it quickly became a nightmare for the enterprise and some of the most
popular websites on the web.
VACCINE RELEASED FOR LOG4SHELL
Friday evening, cybersecurity firm Cybereason released a script, or "vaccine,"
that exploits the vulnerability to turn off a setting in remote, vulnerable
Log4Shell instance. Basically, the vaccine fixes the vulnerability by exploiting
the vulnerable server.
This project is called 'Logout4Shell' and walks you through setting up a
Java-based LDAP server and includes a Java payload that will disable the
'trustURLCodebase' setting in a remote Log4j server to mitigate the
vulnerability.
"While the best mitigation against this vulnerability is to patch log4j to
2.15.0 and above, in Log4j version (>=2.10) this behavior can be mitigated by
setting system property log4j2.formatMsgNoLookups to true or by removing the
JndiLookup class from the classpath," Cybereason explains on the Logout4Shell
GitHub Page.
"Additionally, if the server has Java runtimes >= 8u121, then by default, the
settings com.sun.jndi.rmi.object.trustURLCodebase and com.sun.jndi.cosnaming.object.trustURLCodebase are
set to “false”, mitigating this risk.
This may sound like a helpful tool to quickly neutralize the vulnerability in an
environment you manage. Still, there are obvious concerns that threat actors or
grey hat hackers will co-opt it for illegal behavior.
It is common for threat actors to breach a device and patch vulnerabilities to
block other hackers from taking over a compromised server.
There is also concern that security researchers may use the vulnerability to
remotely fix servers, even though doing something like this is considered
illegal.
However, this has not stopped grey hats from using exploits to take vulnerable
devices offline. In the past, we saw the BrickerBot malware take vulnerable
routers offline, and gray hates exploiting Internet-connected printers to issue
warnings to take them offline.
When we asked Cybereason if they were concerned their Logout4Shell project could
be abused, Cybereason CTO Yonatan Striem-Amit told BleepingComputer that they
believe the benefits outweigh the potential for abuse in this situation.
> While always a possibility, it’s an issue of a calculated risk. This
> vulnerability is so critical and already massively abused across the Internet,
> we felt compelled to offer something to help defenders across the globe buy
> precious time against these hackers.
>
> From an impact perspective, it’s very similar to the Apache Struts
> vulnerability that was used to steal information from Equifax in May-July
> 2017." - Yonatan Striem-Amit, CTO and Co-founder, Cybereason.
If you are interested in trying out Logout4Shell, you can visit the project's
GitHub page.
RELATED ARTICLES:
New zero-day exploit for Log4j Java library is an enterprise nightmare
Minecraft rushes out patch for critical Log4j vulnerability
New Cerber ransomware targets Confluence and GitLab servers
Microsoft shares temp fix for ongoing Office 365 zero-day attacks
Microsoft fixes Windows CVE-2021-40444 MSHTML zero-day bug
* Apache
* Apache Log4j
* Log4j
* Log4Shell
* Remote Code Execution
* Vaccine
* Vulnerability
* Facebook
* Twitter
* LinkedIn
* Email
*
LAWRENCE ABRAMS
Lawrence Abrams is the owner and Editor in Chief of BleepingComputer.com.
Lawrence's area of expertise includes Windows, malware removal, and computer
forensics. Lawrence Abrams is a co-author of the Winternals Defragmentation,
Recovery, and Administration Field Guide and the technical editor for Rootkits
for Dummies.
* Previous Article
POST A COMMENT COMMUNITY RULES
YOU NEED TO LOGIN IN ORDER TO POST A COMMENT
Not a member yet? Register Now
YOU MAY ALSO LIKE:
Popular Stories
* New zero-day exploit for Log4j Java library is an enterprise nightmare
* Massive attack against 1.6 million WordPress sites underway
NEWSLETTER SIGN UP
To receive periodic updates and news from BleepingComputer, please use the form
below.
NEWSLETTER SIGN UP
* Follow us:
*
*
*
*
MAIN SECTIONS
* News
* Downloads
* Virus Removal Guides
* Tutorials
* Startup Database
* Uninstall Database
* File Database
* Glossary
COMMUNITY
* Forums
* Forum Rules
* Chat
USEFUL RESOURCES
* Welcome Guide
* Sitemap
COMPANY
* About BleepingComputer
* Contact Us
* Send us a Tip!
* Advertising
* Write for BleepingComputer
* Social & Feeds
* Changelog
Terms of Use - Privacy Policy - Ethics Statement
Copyright @ 2003 - 2021 Bleeping Computer® LLC - All Rights Reserved
LOGIN
Username
Password
Remember Me
Sign in anonymously
Sign in with Twitter
--------------------------------------------------------------------------------
Not a member yet? Register Now
REPORTER
HELP US UNDERSTAND THE PROBLEM. WHAT IS GOING ON WITH THIS COMMENT?
* Spam
* Abusive or Harmful
* Inappropriate content
* Strong language
* Other
*
Read our posting guidelinese to learn what content is prohibited.
Submitting...
SUBMIT