7.5
HIGH
CVE-2023-43809
Soft Serve SSH Public Key Bypass Remote Authentication Vulnerability
Description

Soft Serve is a self-hostable Git server for the command line. Prior to version 0.6.2, a security vulnerability in Soft Serve could allow an unauthenticated, remote attacker to bypass public key authentication when keyboard-interactive SSH authentication is active, through the `allow-keyless` setting, and the public key requires additional client-side verification for example using FIDO2 or GPG. This is due to insufficient validation procedures of the public key step during SSH request handshake, granting unauthorized access if the keyboard-interaction mode is utilized. An attacker could exploit this vulnerability by presenting manipulated SSH requests using keyboard-interactive authentication mode. This could potentially result in unauthorized access to the Soft Serve. Users should upgrade to the latest Soft Serve version `v0.6.2` to receive the patch for this issue. To workaround this vulnerability without upgrading, users can temporarily disable Keyboard-Interactive SSH Authentication using the `allow-keyless` setting.

INFO

Published Date :

Oct. 4, 2023, 9:15 p.m.

Last Modified :

Nov. 21, 2024, 8:24 a.m.

Remotely Exploitable :

Yes !

Impact Score :

3.6

Exploitability Score :

3.9
Affected Products

The following products are affected by CVE-2023-43809 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 Charm soft_serve

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-2023-43809 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2023-43809 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/charmbracelet/soft-serve/commit/407c4ec72d1006cee1ff8c1775e5bcc091c2bc89
    Added Reference https://github.com/charmbracelet/soft-serve/issues/389
    Added Reference https://github.com/charmbracelet/soft-serve/releases/tag/v0.6.2
    Added Reference https://github.com/charmbracelet/soft-serve/security/advisories/GHSA-mc97-99j4-vm2v
  • CVE Modified by [email protected]

    May. 14, 2024

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

    Oct. 10, 2023

    Action Type Old Value New Value
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
    Changed Reference Type https://github.com/charmbracelet/soft-serve/commit/407c4ec72d1006cee1ff8c1775e5bcc091c2bc89 No Types Assigned https://github.com/charmbracelet/soft-serve/commit/407c4ec72d1006cee1ff8c1775e5bcc091c2bc89 Patch
    Changed Reference Type https://github.com/charmbracelet/soft-serve/issues/389 No Types Assigned https://github.com/charmbracelet/soft-serve/issues/389 Exploit, Issue Tracking
    Changed Reference Type https://github.com/charmbracelet/soft-serve/releases/tag/v0.6.2 No Types Assigned https://github.com/charmbracelet/soft-serve/releases/tag/v0.6.2 Release Notes
    Changed Reference Type https://github.com/charmbracelet/soft-serve/security/advisories/GHSA-mc97-99j4-vm2v No Types Assigned https://github.com/charmbracelet/soft-serve/security/advisories/GHSA-mc97-99j4-vm2v Vendor Advisory
    Added CPE Configuration OR *cpe:2.3:a:charm:soft_serve:*:*:*:*:*:go:*:* versions up to (excluding) 0.6.2
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-2023-43809 is associated with the following CWEs:

Exploit Prediction

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

0.32 }} -0.05%

score

0.70137

percentile

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