Security News
Microsoft has revised its mitigation measures for the newly disclosed and actively exploited zero-day flaws in Exchange Server after it was found that they could be trivially bypassed. The two vulnerabilities, tracked as CVE-2022-41040 and CVE-2022-41082, have been codenamed ProxyNotShell due to similarities to another set of flaws called ProxyShell, which the tech giant resolved last year.
Microsoft is warning Exchange Online users about a rise in password spray attacks, urging those that have yet to disable Basic Authentication to at least set up authentication policies to protect their users and data. For three years, Microsoft been weaning popular software offerings like Outlook Desktop and Outlook Mobile App off Basic Auth in favor of more secure user authentication methods.
The Cybersecurity and Infrastructure Security Agency late on Friday placed the flaw - tracked as CVE-2022-36804 - on its catalog of Known Exploited Vulnerabilities, effectively a must-patch list. CISA put the vulnerability in Bitbucket Server and Data Center tools on the KEV list on the same day as two high-profile Microsoft Exchange zero-day flaws.
Scammers are impersonating security researchers to sell fake proof-of-concept ProxyNotShell exploits for newly discovered Microsoft Exchange zero-day vulnerabilities. Last week, Vietnamese cybersecurity firm GTSC disclosed that some of their customers had been attacked using two new zero-day vulnerabilities in Microsoft Exchange.
Microsoft has shared mitigations for two new Microsoft Exchange zero-day vulnerabilities tracked as CVE-2022-41040 and CVE-2022-41082, but researchers warn that the mitigation for on-premise servers is far from enough. Threat actors are already chaining both of these zero-day bugs in active attacks to breach Microsoft Exchange servers and achieve remote code execution.
Internet snoops have been caught concealing spyware in an old Windows logo in an attack on governments in the Middle East. The Witchetty gang used steganography to stash backdoor Windows malware - dubbed Backdoor.
Internet snoops has been caught concealing spyware in an old Windows logo in an attack on governments in the Middle East. The Witchetty gang used steganography to stash backdoor Windows malware, dubbed Backdoor.
Microsoft is working on updating Microsoft Defender for Office 365 to allow Microsoft Teams users to alert their organization's security team of any dodgy messages they receive.Microsoft Defender for Office 365 protects organizations from malicious threats from email messages, links, and collaboration tools.
Just having your Exchange server accessible to email users over the internet is not enough on its own to expose you to attack, because so-called unauthenticated invocation of these bugs is not possible. According to Microsoft, blocking TCP ports 5985 and 5986 on your Exchange server will limit attackers from chaining from the first vulnerability to the second.
Attackers are leveraging two zero-day vulnerabilities to breach Microsoft Exchange servers."At this time, Microsoft is aware of limited targeted attacks using the two vulnerabilities to get into users' systems. In these attacks, CVE-2022-41040 can enable an authenticated attacker to remotely trigger CVE-2022-41082. It should be noted that authenticated access to the vulnerable Exchange Server is necessary to successfully exploit either of the two vulnerabilities."