GLSA 202509-06: ProFTPd: SSH Terrapin vulnerability

http://security.gentoo.org/

Severity:	normal
Title:	ProFTPd: SSH Terrapin vulnerability
Date:	09/17/2025
Bugs:	#920385
ID:	202509-06

Synopsis

A vulnerability has been discovered in ProFTPd, which can lead to loss of confidentiality.

Background

ProFTPD is an advanced and very configurable FTP server.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
net-ftp/proftpd	< 1.3.8b	>= 1.3.8b	All supported architectures

Description

A vulnerability has been discovered in ProFTPd. Please review the CVE identifier referenced below for details.

Impact

The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6 and other products, allows remote attackers to bypass integrity checks such that some packets are omitted (from the extension negotiation message), and a client and server may consequently end up with a connection for which some security features have been downgraded or disabled, aka a Terrapin attack.

Workaround

There is no known workaround at this time.

Resolution

All ProFTPd users should upgrade to the latest version:

          # emerge --sync
          # emerge --ask --oneshot --verbose ">=net-ftp/proftpd-1.3.8b"

References

CVE-2023-48795

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-202509-06.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.