We see that one of our vulnerabilities is exploited in the wild Link. So we decided to public the detail analysis of our two bug chains. Any customer has enough information to mitigate these bugs. The vendor also released all patches a week ago. This blog post shares the detail

Thousands of small to medium size businesses are suffering as Rackspace have suffered a security incident on their Hosted Exchange service. Yesterday, 2nd December 2022, Rackspace announced an outage to their Hosted Exchange Server:

Hi, this is a long-time-pending article. We could have published this article earlier (the original bug was reported to MSRC in June 2021 with a 90-days Public Disclosure Policy). However, during communications with MSRC, they explained that since this is an architectural design issue, lots of code changes and testings are expected and required, so they hope to resolve this problem with a one-time CU (Cumulative Update) instead of the regular Patch Tuesday. We understand their situation and agree to extend the deadline.

Circa the beginning of August 2022, while doing security monitoring & incident response services, GTSC SOC team discovered that a critical infrastructure was being attacked, specifically to their Microsoft Exchange application. During the investigation, GTSC Blue Team experts determined that the attack utilized an unpublished Exchange security vulnerability, i.e., a 0-day vulnerability, thus immediately came up with a temporary containment plan.

Microsoft discovered an attack where attackers installed a malicious OAuth application in compromised tenants and used their Exchange Online service to launch spam runs.

In early 2022, we investigated an IIS backdoor called SessionManager. It has been used against NGOs, government, military and industrial organizations in Africa, South America, Asia, Europe, Russia and the Middle East.

In early 2022, we investigated an IIS backdoor called SessionManager. It has been used against NGOs, government, military and industrial organizations in Africa, South America, Asia, Europe, Russia and the Middle East.