One common approach is exposing only a few hardened service endpoints that act as a proxy for the other services.

This concept introduced new security challenges, as security models are no longer hardcoded into applications. One of the main benefits of SOA is that it allows for greater flexibility and scalability by erasing application boundaries. The main idea behind SOA is to allow different software components to be developed and maintained independently and to be composed and reused in different combinations to create new systems. It is a software design approach that involves organizing a system as a collection of services that communicate with each other through well-defined interfaces. Service-oriented architecture (SOA) has survived for a long time – and for a good reason. We decided to release a technical advisory describing these attacks, but also documenting some of the recent attacks that we’ve detected in the wild. SSRF attacks on Microsoft Exchange servers are some of the most popular and routinely exploited vulnerabilities.

At the end of November 2022, experts from Bitdefender Labs started to notice an increase in attacks using ProxyNotShell/OWASSRF exploits chains to target on-premises Microsoft Exchange deployments.

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