Post-Auth External Entity Expansion (XXE)
CVE-2021-21250

7.7HIGH

Key Information:

Vendor

Theonedev

Status
Onedev
Vendor
CVE Published:
15 January 2021

What is CVE-2021-21250?

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.

Affected Version(s)

onedev < 4.0.3

References

https://github.com/theonedev/onedev/security/advisories/G...
x_refsource_CONFIRM
https://github.com/theonedev/onedev/commit/9196fd795e87da...
x_refsource_MISC

CVSS V3.1

Score:
7.7
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.