SB2025062451 - Information disclosure in libssh

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Main Vulnerability Database SB2025062451

SB2025062451 - Information disclosure in libssh

Published: June 24, 2025 Updated: August 12, 2025

Security Bulletin ID SB2025062451
Severity
Medium
Patch available
YES
Number of vulnerabilities 3
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

Medium 33% Low 67%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 3 secuirty vulnerabilities.


1) Out-of-bounds read (CVE-ID: CVE-2025-5318)

The vulnerability allows a remote user to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition within the sftp_handle() function. A remote user can trigger an out-of-bounds read error and read contents of memory on the system.


2) Use-after-free (CVE-ID: CVE-2025-4878)

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error within the privatekey_from_file() function. A local user can trigger a use-after-free error and execute arbitrary code with elevated privileges. 



3) Integer overflow (CVE-ID: CVE-2025-4877)

The vulnerability allows a local user to execute arbitrary code on the target system.

The vulnerability exists due to integer overflow within the bin_to_base64() function in base64.c. A local user can trigger an integer overflow and execute arbitrary code on the target system.

Note, the vulnerability can be exploited only via the ssh_get_fingerprint_hash() function on 32-bit builds in case the API is (mis)used and a libssh consumer passes in an unexpectedly large input buffer.


Remediation

Install update from vendor's website.

References