CVE-2018-8899 : IdentityServer IdentityServer4 1.x before 1.5.3 and 2.x before 2.1.3 does not en

IdentityServer IdentityServer4 1.x before 1.5.3 and 2.x before 2.1.3 does not encode the redirect URI on the authorization response page, which might lead to XSS in some configurations.

Published 2018-03-22 05:29:00

Updated 2018-04-18 01:28:52

Source MITRE

View at NVD, CVE.org

Vulnerability category: Cross site scripting (XSS)

Products affected by CVE-2018-8899

Identityserver » Identityserver4
Versions from including (>=) 2.0.0 and up to, including, (<=) 2.1.2
cpe:2.3:a:identityserver:identityserver4:*:*:*:*:*:*:*:*
Matching versions
Identityserver » Identityserver4
Versions from including (>=) 1.0.0 and up to, including, (<=) 1.5.2
cpe:2.3:a:identityserver:identityserver4:*:*:*:*:*:*:*:*
Matching versions

Exploit prediction scoring system (EPSS) score for CVE-2018-8899

EPSS FAQ

0.12%

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

~ 46 %

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

CVSS scores for CVE-2018-8899

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
4.3	MEDIUM	AV:N/AC:M/Au:N/C:N/I:P/A:N	8.6	2.9	NIST
Access Vector: Network Access Complexity: Medium Authentication: None Confidentiality Impact: None Integrity Impact: Partial Availability Impact: None
6.1	MEDIUM	CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N	2.8	2.7	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: Required Scope: Changed Confidentiality: Low Integrity: Low Availability: None

CWE ids for CVE-2018-8899

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2018-8899

https://github.com/IdentityServer/IdentityServer4/issues/2164

Encode redirect uri on authorization response · Issue #2164 · IdentityServer/IdentityServer4 · GitHub
Issue Tracking;Third Party Advisory
https://github.com/IdentityServer/IdentityServer4/releases/tag/2.1.3

Release 2.1.3 · IdentityServer/IdentityServer4 · GitHub
Third Party Advisory
https://github.com/IdentityServer/IdentityServer4/releases/tag/1.5.3

Release 1.5.3 · IdentityServer/IdentityServer4 · GitHub
Third Party Advisory
https://github.com/IdentityServer/IdentityServer4/commit/21d0da227f50ac102de469a13bc5a15d2cc0f895

encode redirect uri in authorize response · IdentityServer/IdentityServer4@21d0da2 · GitHub
Patch;Third Party Advisory

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Vulnerability Details : CVE-2018-8899

Products affected by CVE-2018-8899

Exploit prediction scoring system (EPSS) score for CVE-2018-8899

CVSS scores for CVE-2018-8899

CWE ids for CVE-2018-8899

References for CVE-2018-8899