5.0
MEDIUM
CVE-2023-23943
Nextcloud Mail Internal Service Discovery Information Disclosure Vulnerability
Description

Nextcloud mail is an email app for the nextcloud home server platform. In affected versions the SMTP, IMAP and Sieve host fields allowed to scan for internal services and servers reachable from within the local network of the Nextcloud Server. It is recommended that the Nextcloud Maill app is upgraded to 1.15.0 or 2.2.2. The only known workaround for this issue is to completely disable the nextcloud mail app.

INFO

Published Date :

Feb. 6, 2023, 9:15 p.m.

Last Modified :

Nov. 21, 2024, 7:47 a.m.

Remotely Exploitable :

Yes !

Impact Score :

1.4

Exploitability Score :

3.1
Affected Products

The following products are affected by CVE-2023-23943 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Nextcloud nextcloud_server
2 Nextcloud mail
3 Nextcloud notes
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-2023-23943.

URL Resource
https://github.com/nextcloud/mail/pull/7796 Patch
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-8gcx-r739-9pf6 Vendor Advisory
https://hackerone.com/reports/1736390 Exploit Third Party Advisory
https://hackerone.com/reports/1741525 Exploit Third Party Advisory
https://hackerone.com/reports/1746582 Exploit Third Party Advisory
https://github.com/nextcloud/mail/pull/7796 Patch
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-8gcx-r739-9pf6 Vendor Advisory
https://hackerone.com/reports/1736390 Exploit Third Party Advisory
https://hackerone.com/reports/1741525 Exploit Third Party Advisory
https://hackerone.com/reports/1746582 Exploit 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-2023-23943 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2023-23943 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 af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference https://github.com/nextcloud/mail/pull/7796
    Added Reference https://github.com/nextcloud/security-advisories/security/advisories/GHSA-8gcx-r739-9pf6
    Added Reference https://hackerone.com/reports/1736390
    Added Reference https://hackerone.com/reports/1741525
    Added Reference https://hackerone.com/reports/1746582
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • Initial Analysis by [email protected]

    Feb. 15, 2023

    Action Type Old Value New Value
    Added CVSS V3.1 NIST AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
    Changed Reference Type https://github.com/nextcloud/mail/pull/7796 No Types Assigned https://github.com/nextcloud/mail/pull/7796 Patch
    Changed Reference Type https://github.com/nextcloud/security-advisories/security/advisories/GHSA-8gcx-r739-9pf6 No Types Assigned https://github.com/nextcloud/security-advisories/security/advisories/GHSA-8gcx-r739-9pf6 Vendor Advisory
    Changed Reference Type https://hackerone.com/reports/1736390 No Types Assigned https://hackerone.com/reports/1736390 Exploit, Third Party Advisory
    Changed Reference Type https://hackerone.com/reports/1741525 No Types Assigned https://hackerone.com/reports/1741525 Exploit, Third Party Advisory
    Changed Reference Type https://hackerone.com/reports/1746582 No Types Assigned https://hackerone.com/reports/1746582 Exploit, Third Party Advisory
    Added CPE Configuration OR *cpe:2.3:a:nextcloud:mail:*:*:*:*:*:*:*:* versions up to (excluding) 1.15.0 *cpe:2.3:a:nextcloud:mail:*:*:*:*:*:*:*:* versions from (including) 2.2.0 up to (excluding) 2.2.2
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2023-23943 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-2023-23943 weaknesses.

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.12 }} 0.01%

score

0.45979

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability