CVE-2021-21242 : OneDev is an all-in-one devops platform. In OneDev before version 4.0.3, there i

OneDev is an all-in-one devops platform. In OneDev before version 4.0.3, there is a critical vulnerability which can lead to pre-auth remote code execution. AttachmentUploadServlet deserializes untrusted data from the `Attachment-Support` header. This Servlet does not enforce any authentication or authorization checks. This issue may lead to pre-auth remote code execution. This issue was fixed in 4.0.3 by removing AttachmentUploadServlet and not using deserialization

Published 2021-01-15 21:15:13

Updated 2021-01-21 14:54:39

Source GitHub, Inc.

View at NVD, CVE.org

Vulnerability category: Execute code

Products affected by CVE-2021-21242

Onedev Project » Onedev
Versions before (<) 4.0.3
cpe:2.3:a:onedev_project:onedev:*:*:*:*:*:*:*:*
Matching versions

Exploit prediction scoring system (EPSS) score for CVE-2021-21242

EPSS FAQ

63.82%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 98 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-21242

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
7.5	HIGH	AV:N/AC:L/Au:N/C:P/I:P/A:P	10.0	6.4	NIST
Access Vector: Network Access Complexity: Low Authentication: None Confidentiality Impact: Partial Integrity Impact: Partial Availability Impact: Partial
9.8	CRITICAL	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	3.9	5.9	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: High Integrity: High Availability: High
10.0	CRITICAL	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N	3.9	5.8	GitHub, Inc.
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Changed Confidentiality: High Integrity: High Availability: None

CWE ids for CVE-2021-21242

CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.

Assigned by: security-advisories@github.com (Secondary)
CWE-502 Deserialization of Untrusted Data

The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2021-21242

https://github.com/theonedev/onedev/commit/f864053176c08f59ef2d97fea192ceca46a4d9be

Do not use deserialized AttachmentSupport from client side to avoid s… · theonedev/onedev@f864053 · GitHub
Patch;Third Party Advisory
https://github.com/theonedev/onedev/security/advisories/GHSA-5q3q-f373-2jv8

Pre-Auth Unsafe Deserialization on AttachmentUploadServet · Advisory · theonedev/onedev · GitHub
Third Party Advisory

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Vulnerability Details : CVE-2021-21242

Products affected by CVE-2021-21242

Exploit prediction scoring system (EPSS) score for CVE-2021-21242

CVSS scores for CVE-2021-21242

CWE ids for CVE-2021-21242

References for CVE-2021-21242