CVE-2021-27277 Deserialization in Orion Virtual Infrastructure Monitor

What is CVE-2021-27277?

CVE-2021-27277 is a high-severity unsafe deserialization vulnerability in SolarWinds Orion Virtual Infrastructure Monitor, published on 22 Apr 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

This vulnerability allows local attackers to escalate privileges on affected installations of SolarWinds Orion Virtual Infrastructure Monitor 2020.2. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the OneTimeJobSchedulerEventsService WCF service. The issue results from the lack of proper validation of user-supplied data, which can result in deserialization of untrusted data. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of SYSTEM. Was ZDI-CAN-11955.

Weakness: CWE-502

Which versions are affected by CVE-2021-27277?

It affects 1 product.

Products include Solarwinds Orion Platform.

How do I fix CVE-2021-27277?

No fix has been published for CVE-2021-27277 yet. Limit exposure of the affected software until one is available.

Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.

Is CVE-2021-27277 being exploited?

There is no known exploitation of CVE-2021-27277 in the wild and no public exploit code.

Other vulnerabilities in SolarWinds Orion Virtual Infrastructure Monitor

• CVE-2020-10148 SolarWinds Orion Authentication Bypass Exploited Critical 9.8
• CVE-2021-27258 Privilege escalation in Orion Platform Critical 9.8
• CVE-2021-25274 Deserialization in n/a Critical 9.8
• CVE-2019-9546 Privilege escalation in n/a Critical 9.8
• CVE-2020-13169 Cross-site scripting in n/a Critical 9.0

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-jv8c-r873-24qg.