• Home
  • Cyber Crime
  • Cyber warfare
  • APT
  • Data Breach
  • Deep Web
  • Digital ID
  • Hacking
  • Hacktivism
  • Intelligence
  • Internet of Things
  • Laws and regulations
  • Malware
  • Mobile
  • Reports
  • Security
  • Social Networks
  • Terrorism
  • ICS-SCADA
  • POLICIES
  • Contact me
MUST READ

Microsoft uncovers macOS flaw allowing bypass TCC protections and exposing sensitive data

 | 

U.S. CISA adds Cisco ISE and PaperCut NG/MF flaws to its Known Exploited Vulnerabilities catalog

 | 

Critical WordPress Post SMTP plugin flaw exposes 200K+ sites to full takeover

 | 

Scattered Spider targets VMware ESXi in using social engineering

 | 

China-linked group Fire Ant exploits VMware and F5 flaws since early 2025

 | 

Allianz Life data breach exposed the data of most of its 1.4M customers

 | 

SECURITY AFFAIRS MALWARE NEWSLETTER ROUND 55

 | 

Security Affairs newsletter Round 534 by Pierluigi Paganini – INTERNATIONAL EDITION

 | 

Law enforcement operations seized BlackSuit ransomware gang’s darknet sites

 | 

Arizona woman sentenced for aiding North Korea in U.S. IT job fraud scheme

 | 

Operation CargoTalon targets Russia’s aerospace with EAGLET malware,

 | 

Unpatched flaw in EoL LG LNV5110R cameras lets hackers gain Admin access

 | 

Koske, a new AI-Generated Linux malware appears in the threat landscape

 | 

Mitel patches critical MiVoice MX-ONE Auth bypass flaw

 | 

Coyote malware is first-ever malware abusing Windows UI Automation

 | 

SonicWall fixed critical flaw in SMA 100 devices exploited in Overstep malware attacks

 | 

DSPM & AI Are Booming: $17.87B and $4.8T Markets by 2033

 | 

Stealth backdoor found in WordPress mu-Plugins folder

 | 

U.S. CISA adds CrushFTP, Google Chromium, and SysAid flaws to its Known Exploited Vulnerabilities catalog

 | 

U.S. CISA urges FCEB agencies to fix two Microsoft SharePoint flaws immediately and added them to its Known Exploited Vulnerabilities catalog

 | 
  • Home
  • Cyber Crime
  • Cyber warfare
  • APT
  • Data Breach
  • Deep Web
  • Digital ID
  • Hacking
  • Hacktivism
  • Intelligence
  • Internet of Things
  • Laws and regulations
  • Malware
  • Mobile
  • Reports
  • Security
  • Social Networks
  • Terrorism
  • ICS-SCADA
  • POLICIES
  • Contact me
  • Home
  • Breaking News
  • Hacking
  • Social Networks
  • Facebook hacked, someone deployed a malicious webshell on its server

Facebook hacked, someone deployed a malicious webshell on its server

Pierluigi Paganini April 22, 2016

Facebook hacked!  The security expert Orange Tsai discovered the presence of a malicious webshell on one of the company servers.

The security expert Orange Tsai from the DevCore firm has found a malicious web shell on Facebook Server. The researcher was analyzing the Facebook’s infrastructure when noticed a domain called files.fb.com. Intrigued, the expert has tried to access the domain discovering that it was hosting an instance of the Accellion File Transfer Appliance that is used by companies or secure file transfers.

Once accessed the domain it displayed a login interface for the File Transfer Appliance then he decided to investigate the presence of security vulnerabilities in the software.

He verified that Facebook already fixed known flaw in the software then he decided to search for new security issues in the appliance. Tsai discovered a total of 7 zero-day flaws, including cross-site scripting, remote code execution, and local privilege escalation vulnerabilities.

facebook hacked

He exploited a pre-auth SQL injection flaw to upload a webshell to the Facebook server and gain its control. At this point, he noticed something of really strange, someone had anticipated him by uploading a webshell to the server.

“While collecting vulnerability details and evidences for reporting to Facebook, I found some strange things on web log. First of all I found some strange PHP error messages in “/var/opt/apache/php_error_log” These error messages seemed to be caused by modifying codes online?” wrote Tsai. “I followed the PHP paths in error messages and ended up with discovering suspicious WEBSHELL files left by previous “visitors”.”

facebook hacked 2

At this point, he tried to collect more data related to the alleged intrusion and discovered that the threat actor attempted to collect the login credentials of company employees who used the Accellion File Transfer Appliance.

The expert sustains that hackers used a script that had harvested at least 300 @fb.com and @facebook.com credentials in the period of time between February 1 and February 7.

By analyzing the logs he also discovered that threat actors gained access on two occasions to the system, the first time in July 2015 and later in September 2015.

The unauthorized accessed in July occurred just days before Rapid7 disclosed two vulnerabilities in the Accellion File Transfer Appliance.

Of course, there is no evidence that the intrusions were carried out by the same hacker and how the attackers breached the systems deploying the malicious webshell.

Tsai reported his discoveries to Facebook  that admitted the existence of the Webshell and rewarded him with $10,000. He also reported the flaws discovered in the  Accellion platform to the company.

[adrotate banner=”9″]

Pierluigi Paganini

(Security Affairs – Facebook hacked, webshell)


facebook linkedin twitter

Facebook hacked Hacking Pierluigi Paganini Security Affairs webshell

you might also like

Pierluigi Paganini July 29, 2025
Microsoft uncovers macOS flaw allowing bypass TCC protections and exposing sensitive data
Read more
Pierluigi Paganini July 28, 2025
U.S. CISA adds Cisco ISE and PaperCut NG/MF flaws to its Known Exploited Vulnerabilities catalog
Read more

leave a comment

newsletter

Subscribe to my email list and stay
up-to-date!

    recent articles

    Microsoft uncovers macOS flaw allowing bypass TCC protections and exposing sensitive data

    Hacking / July 29, 2025

    U.S. CISA adds Cisco ISE and PaperCut NG/MF flaws to its Known Exploited Vulnerabilities catalog

    Security / July 28, 2025

    Critical WordPress Post SMTP plugin flaw exposes 200K+ sites to full takeover

    Security / July 28, 2025

    Scattered Spider targets VMware ESXi in using social engineering

    Cyber Crime / July 28, 2025

    China-linked group Fire Ant exploits VMware and F5 flaws since early 2025

    Hacking / July 28, 2025

    To contact me write an email to:

    Pierluigi Paganini :
    pierluigi.paganini@securityaffairs.co

    LEARN MORE

    QUICK LINKS

    • Home
    • Cyber Crime
    • Cyber warfare
    • APT
    • Data Breach
    • Deep Web
    • Digital ID
    • Hacking
    • Hacktivism
    • Intelligence
    • Internet of Things
    • Laws and regulations
    • Malware
    • Mobile
    • Reports
    • Security
    • Social Networks
    • Terrorism
    • ICS-SCADA
    • POLICIES
    • Contact me

    Copyright@securityaffairs 2024

    We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. By clicking “Accept All”, you consent to the use of ALL the cookies. However, you may visit "Cookie Settings" to provide a controlled consent.
    Cookie SettingsAccept All
    Manage consent

    Privacy Overview

    This website uses cookies to improve your experience while you navigate through the website. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities...
    Necessary
    Always Enabled
    Necessary cookies are absolutely essential for the website to function properly. This category only includes cookies that ensures basic functionalities and security features of the website. These cookies do not store any personal information.
    Non-necessary
    Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. It is mandatory to procure user consent prior to running these cookies on your website.
    SAVE & ACCEPT