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Vulnerability Details :

CVE-2020-5268

Summary
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
Published At-21 Apr, 2020 | 15:30
Updated At-04 Aug, 2024 | 08:22
Rejected At-
Credits

Subject Confirmation Method not validated in Saml2 Authentication Services for ASP.NET

In Saml2 Authentication Services for ASP.NET versions before 1.0.2, and between 2.0.0 and 2.6.0, there is a vulnerability in how tokens are validated in some cases. Saml2 tokens are usually used as bearer tokens - a caller that presents a token is assumed to be the subject of the token. There is also support in the Saml2 protocol for issuing tokens that is tied to a subject through other means, e.g. holder-of-key where possession of a private key must be proved. The Sustainsys.Saml2 library incorrectly treats all incoming tokens as bearer tokens, even though they have another subject confirmation method specified. This could be used by an attacker that could get access to Saml2 tokens with another subject confirmation method than bearer. The attacker could then use such a token to create a log in session. This vulnerability is patched in versions 1.0.2 and 2.7.0.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:GitHub_M
Assigner Org ID:a0819718-46f1-4df5-94e2-005712e83aaa
Published At:21 Apr, 2020 | 15:30
Updated At:04 Aug, 2024 | 08:22
Rejected At:
▼CVE Numbering Authority (CNA)
Subject Confirmation Method not validated in Saml2 Authentication Services for ASP.NET

In Saml2 Authentication Services for ASP.NET versions before 1.0.2, and between 2.0.0 and 2.6.0, there is a vulnerability in how tokens are validated in some cases. Saml2 tokens are usually used as bearer tokens - a caller that presents a token is assumed to be the subject of the token. There is also support in the Saml2 protocol for issuing tokens that is tied to a subject through other means, e.g. holder-of-key where possession of a private key must be proved. The Sustainsys.Saml2 library incorrectly treats all incoming tokens as bearer tokens, even though they have another subject confirmation method specified. This could be used by an attacker that could get access to Saml2 tokens with another subject confirmation method than bearer. The attacker could then use such a token to create a log in session. This vulnerability is patched in versions 1.0.2 and 2.7.0.

Affected Products
Vendor
Sustainsys
Product
Saml2
Versions
Affected
  • < 1.0.2
  • >= 2.0.0, <= 2.6.0
Problem Types
TypeCWE IDDescription
CWECWE-303CWE-303: Incorrect Implementation of Authentication Algorithm
Type: CWE
CWE ID: CWE-303
Description: CWE-303: Incorrect Implementation of Authentication Algorithm
Metrics
VersionBase scoreBase severityVector
3.16.5MEDIUM
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:L/A:N
Version: 3.1
Base score: 6.5
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:L/A:N
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/Sustainsys/Saml2/commit/e58e0a1aff2b1ead6aca080b7cdced55ee6d5241
x_refsource_MISC
https://github.com/Sustainsys/Saml2/security/advisories/GHSA-9475-xg6m-j7pw
x_refsource_CONFIRM
https://github.com/Sustainsys/Saml2/issues/712
x_refsource_MISC
https://www.nuget.org/packages/Sustainsys.Saml2/
x_refsource_MISC
Hyperlink: https://github.com/Sustainsys/Saml2/commit/e58e0a1aff2b1ead6aca080b7cdced55ee6d5241
Resource:
x_refsource_MISC
Hyperlink: https://github.com/Sustainsys/Saml2/security/advisories/GHSA-9475-xg6m-j7pw
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/Sustainsys/Saml2/issues/712
Resource:
x_refsource_MISC
Hyperlink: https://www.nuget.org/packages/Sustainsys.Saml2/
Resource:
x_refsource_MISC
▼Authorized Data Publishers (ADP)
CVE Program Container
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/Sustainsys/Saml2/commit/e58e0a1aff2b1ead6aca080b7cdced55ee6d5241
x_refsource_MISC
x_transferred
https://github.com/Sustainsys/Saml2/security/advisories/GHSA-9475-xg6m-j7pw
x_refsource_CONFIRM
x_transferred
https://github.com/Sustainsys/Saml2/issues/712
x_refsource_MISC
x_transferred
https://www.nuget.org/packages/Sustainsys.Saml2/
x_refsource_MISC
x_transferred
Hyperlink: https://github.com/Sustainsys/Saml2/commit/e58e0a1aff2b1ead6aca080b7cdced55ee6d5241
Resource:
x_refsource_MISC
x_transferred
Hyperlink: https://github.com/Sustainsys/Saml2/security/advisories/GHSA-9475-xg6m-j7pw
Resource:
x_refsource_CONFIRM
x_transferred
Hyperlink: https://github.com/Sustainsys/Saml2/issues/712
Resource:
x_refsource_MISC
x_transferred
Hyperlink: https://www.nuget.org/packages/Sustainsys.Saml2/
Resource:
x_refsource_MISC
x_transferred
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security-advisories@github.com
Published At:21 Apr, 2020 | 17:15
Updated At:06 May, 2020 | 17:26

In Saml2 Authentication Services for ASP.NET versions before 1.0.2, and between 2.0.0 and 2.6.0, there is a vulnerability in how tokens are validated in some cases. Saml2 tokens are usually used as bearer tokens - a caller that presents a token is assumed to be the subject of the token. There is also support in the Saml2 protocol for issuing tokens that is tied to a subject through other means, e.g. holder-of-key where possession of a private key must be proved. The Sustainsys.Saml2 library incorrectly treats all incoming tokens as bearer tokens, even though they have another subject confirmation method specified. This could be used by an attacker that could get access to Saml2 tokens with another subject confirmation method than bearer. The attacker could then use such a token to create a log in session. This vulnerability is patched in versions 1.0.2 and 2.7.0.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Primary3.17.3HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
Secondary3.16.5MEDIUM
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:L/A:N
Primary2.04.9MEDIUM
AV:N/AC:M/Au:S/C:P/I:P/A:N
Type: Primary
Version: 3.1
Base score: 7.3
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
Type: Secondary
Version: 3.1
Base score: 6.5
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:L/A:N
Type: Primary
Version: 2.0
Base score: 4.9
Base severity: MEDIUM
Vector:
AV:N/AC:M/Au:S/C:P/I:P/A:N
CPE Matches
sustainsys
sustainsys
>>saml2>>Versions before 1.0.2(exclusive)
cpe:2.3:a:sustainsys:saml2:*:*:*:*:*:*:*:*
sustainsys
sustainsys
>>saml2>>Versions from 2.0.0(inclusive) to 2.7.0(exclusive)
cpe:2.3:a:sustainsys:saml2:*:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-287Primarynvd@nist.gov
CWE-303Secondarysecurity-advisories@github.com
CWE ID: CWE-287
Type: Primary
Source: nvd@nist.gov
CWE ID: CWE-303
Type: Secondary
Source: security-advisories@github.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/Sustainsys/Saml2/commit/e58e0a1aff2b1ead6aca080b7cdced55ee6d5241security-advisories@github.com
Patch
Third Party Advisory
https://github.com/Sustainsys/Saml2/issues/712security-advisories@github.com
Third Party Advisory
https://github.com/Sustainsys/Saml2/security/advisories/GHSA-9475-xg6m-j7pwsecurity-advisories@github.com
Mitigation
Third Party Advisory
https://www.nuget.org/packages/Sustainsys.Saml2/security-advisories@github.com
Third Party Advisory
Hyperlink: https://github.com/Sustainsys/Saml2/commit/e58e0a1aff2b1ead6aca080b7cdced55ee6d5241
Source: security-advisories@github.com
Resource:
Patch
Third Party Advisory
Hyperlink: https://github.com/Sustainsys/Saml2/issues/712
Source: security-advisories@github.com
Resource:
Third Party Advisory
Hyperlink: https://github.com/Sustainsys/Saml2/security/advisories/GHSA-9475-xg6m-j7pw
Source: security-advisories@github.com
Resource:
Mitigation
Third Party Advisory
Hyperlink: https://www.nuget.org/packages/Sustainsys.Saml2/
Source: security-advisories@github.com
Resource:
Third Party Advisory

Change History

0
Information is not available yet

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