CVE-2020-26290
Dex SAML Connector XML Signature Bypass
Description
Dex is a federated OpenID Connect provider written in Go. In Dex before version 2.27.0 there is a critical set of vulnerabilities which impacts users leveraging the SAML connector. The vulnerabilities enables potential signature bypass due to issues with XML encoding in the underlying Go library. The vulnerabilities have been addressed in version 2.27.0 by using the xml-roundtrip-validator from Mattermost (see related references).
INFO
Published Date :
Dec. 28, 2020, 8:15 p.m.
Last Modified :
Dec. 30, 2020, 3:12 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
6.0
Exploitability Score :
2.8
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2020-26290.
| URL | Resource |
|---|---|
| https://github.com/dexidp/dex/commit/324b1c886b407594196113a3dbddebe38eecd4e8 | Patch Third Party Advisory |
| https://github.com/dexidp/dex/releases/tag/v2.27.0 | Third Party Advisory |
| https://github.com/dexidp/dex/security/advisories/GHSA-m9hp-7r99-94h5 | Third Party Advisory |
| https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-attributes.md | Not Applicable Third Party Advisory |
| https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-directives.md | Not Applicable Third Party Advisory |
| https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-elements.md | Not Applicable Third Party Advisory |
| https://github.com/russellhaering/goxmldsig/security/advisories/GHSA-q547-gmf8-8jr7 | Not Applicable Third Party Advisory |
| https://mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities/ | Not Applicable Third Party Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2020-26290 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2020-26290 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Initial Analysis by [email protected]
Dec. 30, 2020
Action Type Old Value New Value Added CVSS V2 Metadata Victim must voluntarily interact with attack mechanism Added CVSS V2 NIST (AV:N/AC:M/Au:N/C:P/I:P/A:P) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H Changed Reference Type https://github.com/dexidp/dex/commit/324b1c886b407594196113a3dbddebe38eecd4e8 No Types Assigned https://github.com/dexidp/dex/commit/324b1c886b407594196113a3dbddebe38eecd4e8 Patch, Third Party Advisory Changed Reference Type https://github.com/dexidp/dex/releases/tag/v2.27.0 No Types Assigned https://github.com/dexidp/dex/releases/tag/v2.27.0 Third Party Advisory Changed Reference Type https://github.com/dexidp/dex/security/advisories/GHSA-m9hp-7r99-94h5 No Types Assigned https://github.com/dexidp/dex/security/advisories/GHSA-m9hp-7r99-94h5 Third Party Advisory Changed Reference Type https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-attributes.md No Types Assigned https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-attributes.md Not Applicable, Third Party Advisory Changed Reference Type https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-directives.md No Types Assigned https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-directives.md Not Applicable, Third Party Advisory Changed Reference Type https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-elements.md No Types Assigned https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-elements.md Not Applicable, Third Party Advisory Changed Reference Type https://github.com/russellhaering/goxmldsig/security/advisories/GHSA-q547-gmf8-8jr7 No Types Assigned https://github.com/russellhaering/goxmldsig/security/advisories/GHSA-q547-gmf8-8jr7 Not Applicable, Third Party Advisory Changed Reference Type https://mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities/ No Types Assigned https://mattermost.com/blog/coordinated-disclosure-go-xml-vulnerabilities/ Not Applicable, Third Party Advisory Added CPE Configuration OR *cpe:2.3:a:linuxfoundation:dex:*:*:*:*:*:*:*:* versions up to (excluding) 2.27.0
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2020-26290 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2020-26290
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.40 }} 0.04%
score
0.70393
percentile