CVE-2023-39963 Security Vulnerability & Exploit Details

CVE-2023-39963
Vulnerability Scoring

8.1

/10

Severe Risk

Cybersecurity professionals consider CVE-2023-39963 an immediate threat requiring urgent mitigation.

Attack Complexity Details

Attack Complexity: Low
Exploits can be performed without significant complexity or special conditions.
Attack Vector: Local
Vulnerability requires local system access.
Privileges Required: Low
Some privileges are necessary to exploit the vulnerability.
Scope: Changed
Successful exploitation can impact components beyond the vulnerable component.
User Interaction: Required
User interaction is necessary for successful exploitation.

CVE-2023-39963 Details

Status: Modified

Last updated: 🕗 21 Nov 2024, 08:16 UTC
Originally published on: 🕕 10 Aug 2023, 18:15 UTC

Time between publication and last update: 468 days

CVSS Release: version 3

CVSS3 Source

security-advisories@github.com

CVSS3 Type

Secondary

CVSS3 Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L

CVE-2023-39963 Vulnerability Summary

CVE-2023-39963: Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 20.0.0 and prior to versions 20.0.14.15, 21.0.9.13, 22.2.10.14, 23.0.12.8, 24.0.12.5, 25.0.9, 26.0.4, and 27.0.1, a missing password confirmation allowed an attacker, after successfully stealing a session from a logged in user, to create app passwords for the victim. Nextcloud server versions 25.0.9, 26.0.4, and 27.0.1 and Nextcloud Enterprise Server versions 20.0.14.15, 21.0.9.13, 22.2.10.14, 23.0.12.9, 24.0.12.5, 25.0.9, 26.0.4, and 27.0.1 contain a patch for this issue. No known workarounds are available.

Assessing the Risk of CVE-2023-39963

Access Complexity Graph

The exploitability of CVE-2023-39963 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2023-39963

CVE-2023-39963 presents an accessible attack vector with minimal effort required. Restricting access controls and implementing security updates are critical to reducing exploitation risks.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2023-39963, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2023-39963, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

Confidentiality: High
Exploiting CVE-2023-39963 can result in unauthorized access to sensitive data, severely compromising data privacy.
Integrity: High
CVE-2023-39963 could allow unauthorized modifications to data, potentially affecting system reliability and trust.
Availability: Low
CVE-2023-39963 may slightly degrade system performance without fully affecting service availability.

Exploit Prediction Scoring System (EPSS)

The EPSS score estimates the probability that this vulnerability will be exploited in the near future.

EPSS Score: 0.065% (probability of exploit)

EPSS Percentile: 31.35% (lower percentile = lower relative risk)
This vulnerability is less risky than approximately 68.65% of others.

CVE-2023-39963 References

External References

CWE Common Weakness Enumeration

NVD-CWE-noinfo

Vulnerable Configurations

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cpe:2.3:a:nextcloud:nextcloud_server:20.0.0:-:*:*:*:*:*:*
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cpe:2.3:a:nextcloud:nextcloud_server:20.0.0:beta2:*:*:*:*:*:*
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cpe:2.3:a:nextcloud:nextcloud_server:20.0.0:beta3:*:*:*:*:*:*
cpe:2.3:a:nextcloud:nextcloud_server:20.0.0:beta3:*:*:*:*:*:*
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