So, users are highly recommended to upgrade their software to the 15.8.3, as it's hardly a matter of time before hackers started exploiting the flaw to hack into users' Windows PCs.Ī similar SMB-authentication attack vector was previously disclosed in Google Chrome, Zoom video conferencing app, and Signal messenger. Employee PC hacked via TeamViewer in attempted water supply poisoning Unknown hackers tried to poison the water supply that could have harmed thousands of residents in Oldsmar, Tampa, Florida. Though the vulnerability is not being exploited in the wild as of now, considering the popularity of the software among millions of users, TeamViewer has always been a target of interest for attackers. The TeamViewer project has patched the vulnerability by quoting the parameters passed by the affected URI handlers e.g., URL:teamviewer10 Protocol "C:\Program Files (x86)\TeamViewer\TeamViewer.exe" "%1"
This vulnerability, categorized as 'Unquoted URI handler,' affects "URI handlers teamviewer10, teamviewer8, teamviewerapi, tvchat1, tvcontrol1, tvfiletransfer1, tvjoinv8, tvpresent1, tvsendfile1, tvsqcustomer1, tvsqsupport1, tvvideocall1, and tvvpn1," Hofmann said. Praying Mantis actors then used the access the hacked IIS servers provided to conduct additional malicious tasks, including credential harvesting, reconnaissance, and lateral movement on their targets' networks.Now, the victim's Windows OS will "perform NTLM authentication when opening the SMB share and that request can be relayed (using a tool like responder) for code execution (or captured for hash cracking)." "The operators behind the activity targeted Windows internet-facing servers, using mostly deserialization attacks, to load a completely volatile, custom malware platform tailored for the Windows IIS environment," the researchers said. In their attacks, Praying Mantis used a Checkbox Survey RCE Exploit (CVE-2021-27852), a VIEWSTATE Deserialization and Altserialization Insecure Deserialization exploits, and a Telerik-UI Exploit (CVE-2019-18935, CVE-2017-11317).
We will update our status page with new information as soon as possible. Our engineers have not yet confirmed the underlying root cause and they are working on the identification. The most recent example is an advanced persistent threat (APT) group tracked as Praying Mantis or TG1021, which targeted Microsoft IIS web servers according to an August report from Israeli security firm Sygnia. Investigating - A subset of our users are currently experiencing a connectivity issue when accessing our services.
However, state-sponsored level threat actors have also leveraged various other exploits to compromise internet-facing IIS servers in the past. I've built a PoC for CVE-2021-31166 the "HTTP Protocol Stack Remote Code Execution Vulnerability": /yzgUs2CQO5 - Axel Souchet May 16, 2021
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There hasn't been any malicious activity abusing this flaw in the wild since then and, as we reported at the time, most potential targets were likely safe from attacks given that home users with the latest Windows 10 versions would've updated and companies don't commonly use the latest Window Server versions. 2021 documentary educational news technology.
Microsoft patched the security flaw (tracked as CVE-2021-31166) during the May Patch Tuesday and said it only impacts Windows 10 versions 2004/20H2 and Windows Server versions 2004/20H2.
While the method used by the attackers to compromise IIS servers is not yet known, attackers can use various ways to breach a Windows IIS serverr.įor instance, exploit code targeting a critical wormable vulnerability found in the HTTP Protocol Stack (HTTP.sys) used by the Windows IIS web server has been publicly available since May. TeamViewer installed by TVRAT IIS servers: vulnerable and targeted