CVE-2021-21250

Post-Auth External Entity Expansion (XXE)

Description

OneDev is an all-in-one devops platform. In OneDev before version 4.0.3, there is a critical vulnerability which may lead to arbitrary file read. When BuildSpec is provided in XML format, the spec is processed by XmlBuildSpecMigrator.migrate(buildSpecString); which processes the XML document without preventing the expansion of external entities. These entities can be configured to read arbitrary files from the file system and dump their contents in the final XML document to be migrated. If the files are dumped in properties included in the YAML file, it will be possible for an attacker to read them. If not, it is possible for an attacker to exfiltrate the contents of these files Out Of Band. This issue was addressed in 4.0.3 by ignoring ENTITY instructions in xml file.

Category

7.7
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.29%
Third-Party Advisory github.com Third-Party Advisory github.com
Affected: theonedev onedev
Published at:
Updated at:

References

Link Tags
https://github.com/theonedev/onedev/security/advisories/GHSA-9pph-8gfc-6w2r third party advisory
https://github.com/theonedev/onedev/commit/9196fd795e87dab069b4260a3590a0ea886e770f third party advisory patch

Frequently Asked Questions

What is the severity of CVE-2021-21250?
CVE-2021-21250 has been scored as a high severity vulnerability.
How to fix CVE-2021-21250?
To fix CVE-2021-21250, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-21250 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-21250 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-21250?
CVE-2021-21250 affects theonedev onedev.
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