Tag Archives: ProxyShell

My colleagues from PT ESC discovered a previously unknown keylogger for Microsoft Exchange OWA

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My colleagues from PT ESC discovered a previously unknown keylogger for Microsoft Exchange OWA

My colleagues from PT ESC discovered a previously unknown keylogger for Microsoft Exchange OWA. The injected code collects the logins/passwords that users enter to access the Exchange web interface and stores them in a special file. This file is accessible externally. Thus, attackers simply collect credentials to access confidential information and develop the attack further. 🙂

👾 The malware is installed by exploiting an old ProxyShell vulnerability (CVE-2021-34473, CVE-2021-34523, CVE-2021-31207).

🏛 A total of 30 victims were discovered, including government agencies, banks, IT companies, and educational institutions.

🌍 Countries attacked: Russia, UAE, Kuwait, Oman, Niger, Nigeria, Ethiopia, Mauritius, Jordan, Lebanon and others.

🕵️‍♂️ The fact of compromise can be determined by a specific line in the logon.aspx file.

На русском

VMconf 22: Blindspots in the Knowledge Bases of Vulnerability Scanners

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VMconf 22: Blindspots in the Knowledge Bases of Vulnerability Scanners. Hello everyone! This video was recorded for the VMconf22 Vulnerability Management conference. I want to talk about the blind spots in the knowledge bases of Vulnerability Scanners and Vulnerability Management products.

This report was presented in Russian at Tenable Security Day 2022. The video is here.

Potential customers rarely worry about the completeness of the Knowledge Base when choosing a Vulnerability Scanner. They usually trust the VM vendors’ claims of the “largest vulnerability base” and the total number of detection plugins. But in fact the completeness is very important. All high-level vulnerability prioritization features are meaningless unless the vulnerability has been reliably detected. In this presentation, I will show the examples of blindspots in the knowledge bases of vulnerability management products, try to describe the causes and what we (as customers and the community) can do about it.

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Security News: Exchange ProxyShell, Zoom RCE, Citrix Canceled PT Acknowledgments, Cisco No Patch Router RCEs

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Security News: Exchange ProxyShell, Zoom RCE, Citrix Canceled PT Acknowledgments, Cisco No Patch Router RCEs. Hello everyone! This is a new episode with my comments on the latest Information Security news.

Exchange ProxyShell

I want to start with something about attacks on Exchange. ProxyShell is in the news, the LockFile ransomware compromised more than 2000 servers. On the other hand, there is basically nothing to say here.

ProxyShell is the name for 3 vulnerabilities. The bulletins for Remote Code Execution CVE-2021-34473 and Server Elevation of Privilege CVE-2021-34523 were released on July 13, but were fixed by April Patch Tuesday patches. Yes, it happens sometimes. The bulletin for Security Feature Bypass CVE-2021-31207 was released on May 11. Users had 4 months to install the updates. Interestingly, 2 out of 3 vulnerabilities have the property “Less likely to be exploited”. As you can see, it’s pretty useless.

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