Vulnerability Report

CVE-2023-39953

Title: Missing Issuer Verification in user_oidc

Man-in-the-Middle

Proof Of Concept

No public PoC currently indexed for CVE-2023-39953.

CWE Category CWE-303
Published Date Aug 10, 2023
Modified Date Nov 21, 2024
Exploit Status Not Found
Score 4.8 CVSS v3.1
Exploit Probability (EPSS)
0.54%

Vulnerability Summary

CVE-2023-39953: user_oidc provides the OIDC connect user backend for Nextcloud, an open-source cloud platform. Starting in version 1.0.0 and prior to version 1.3.3, missing verification of the issuer would have allowed an attacker to perform a man-in-the-middle attack returning corrupted or known token they also have access to. user_oidc 1.3.3 contains a patch. No known workarounds are available.

Impacted Vendors

N
nextcloud 1

Reference Links

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xx3h-v363-q36j https://github.com/nextcloud/user_oidc/pull/642 https://hackerone.com/reports/2021684 https://github.com/nextcloud/security-advisories/security/advisories/GHSA-xx3h-v363-q36j https://github.com/nextcloud/user_oidc/pull/642 https://hackerone.com/reports/2021684
CVSS v3.1
Source Entity [email protected]
Severity MEDIUM
4.8
Attack Vector
NETWORK
Complexity
HIGH
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS v3.1
Source Entity [email protected]
Severity MEDIUM
4.8
Attack Vector
NETWORK
Complexity
HIGH
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2023-39953 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

MODIFIED

Vulnerability data or affected products updated.

PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector NETWORK
Complexity HIGH
Privileges N/A
Interaction NONE
CVSS Vector String CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

Affected Stack

No specific products linked.