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RHEL 2.1 : stunnel (RHSA-2003:223)

low Nessus Plugin ID 12406

Synopsis

The remote Red Hat host is missing a security update.

Description

Updated stunnel packages are now available. These updates correct a potential vulnerability in stunnel's signal handling.

Stunnel is a wrapper for network connections. It can be used to tunnel an unencrypted network connection over a secure connection (encrypted using SSL or TLS) or to provide a secure means of connecting to services that do not natively support encryption.

When configured to listen for incoming connections (instead of being invoked by xinetd), stunnel can be configured to either start a thread or a child process to handle each new connection. If Stunnel is configured to start a new child process to handle each connection, it will receive a SIGCHLD signal when that child exits.

Stunnel versions prior to 4.04 would perform tasks in the SIGCHLD signal handler which, if interrupted by another SIGCHLD signal, could be unsafe. This could lead to a denial of service.

All users are urged to upgrade to these errata packages, which modify stunnel's signal handler so that it is not vulnerable to this issue.

NOTE: After upgrading, any instances of stunnel configured to run in daemon mode should be restarted, and any active network connections that are currently being serviced by stunnel should be terminated and reestablished.

Solution

Update the affected stunnel package.

See Also

https://access.redhat.com/security/cve/cve-2002-1563

https://marc.info/?l=stunnel-users&m=103600188215117

https://access.redhat.com/errata/RHSA-2003:223

Plugin Details

Severity: Low

ID: 12406

File Name: redhat-RHSA-2003-223.nasl

Version: 1.29

Type: local

Agent: unix

Published: 7/6/2004

Updated: 1/14/2021

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Low

Base Score: 1.2

Vector: CVSS2#AV:L/AC:H/Au:N/C:N/I:N/A:P

Vulnerability Information

CPE: p-cpe:/a:redhat:enterprise_linux:stunnel, cpe:/o:redhat:enterprise_linux:2.1

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu

Patch Publication Date: 7/25/2003

Vulnerability Publication Date: 5/12/2003

Reference Information

CVE: CVE-2002-1563

RHSA: 2003:223