RedHat: stunnel Signal-handling vulnerability
Summary
Summary
Stunnel is a wrapper for network connections. It can be used to tunnel anunencrypted network connection over an encrypted connection (encryptedusing SSL or TLS) or to provide an encrypted means of connecting toservices that do not natively support encryption.A previous advisory provided updated packages to address re-entrancyproblems in stunnel's signal-handling routines. These updates did notaddress other bugs that were found by Steve Grubb, and introduced anadditional bug, which was fixed in stunnel 3.26.All users should upgrade to these errata packages, which address theseissues by updating stunnel to version 3.26.NOTE: After upgrading, any instances of stunnel configured to run in daemonmode should be restarted, and any active network connections that arecurrently being serviced by stunnel should be terminated and reestablished.
Solution
Before applying this update, make sure all previously released errata
relevant to your system have been applied.
To update all RPMs for your particular architecture, run:
rpm -Fvh [filenames]
where [filenames] is a list of the RPMs you wish to upgrade. Only those
RPMs which are currently installed will be updated. Those RPMs which are
not installed but included in the list will not be updated. Note that you
can also use wildcards (*.rpm) if your current directory *only* contains the
desired RPMs.
Please note that this update is also available via Red Hat Network. Many
people find this an easier way to apply updates. To use Red Hat Network,
launch the Red Hat Update Agent with the following command:
up2date
This will start an interactive process that will result in the appropriate
RPMs being upgraded on your system.
If up2date fails to connect to Red Hat Network due to SSL Certificate
Errors, you need to install a version of the up2date client with an updated
certificate. The latest version of up2date is available from the Red Hat
FTP site and may also be downloaded directly from the RHN website:
5. RPMs required:
Red Hat Linux 7.1:
SRPMS:
i386:
Red Hat Linux 7.2:
SRPMS:
i386:
ia64:
Red Hat Linux 7.3:
SRPMS:
i386:
Red Hat Linux 8.0:
SRPMS:
i386:
6. Verification:
MD5 sum Package Name
cfd2b7c9519812d58a945d4b5e189fdd 7.1/en/os/SRPMS/stunnel-3.26-1.7.1.src.rpm
f05723a19a2990ce17ded0ce817890b5 7.1/en/os/i386/stunnel-3.26-1.7.1.i386.rpm
f1c75122248f440e96adff582de64520 7.2/en/os/SRPMS/stunnel-3.26-1.7.3.src.rpm
e307840b930fc50e4bb2b61a0578af5a 7.2/en/os/i386/stunnel-3.26-1.7.3.i386.rpm
cd223922c7a690d7dfcfdd2e49c49e24 7.2/en/os/ia64/stunnel-3.26-1.7.3.ia64.rpm
f1c75122248f440e96adff582de64520 7.3/en/os/SRPMS/stunnel-3.26-1.7.3.src.rpm
e307840b930fc50e4bb2b61a0578af5a 7.3/en/os/i386/stunnel-3.26-1.7.3.i386.rpm
071ab6a4091737a4292e631bd7490975 8.0/en/os/SRPMS/stunnel-3.26-1.8.0.src.rpm
d3718eebbd8b921de713c4914da22dec 8.0/en/os/i386/stunnel-3.26-1.8.0.i386.rpm
These packages are GPG signed by Red Hat for security. Our key is
available from https://access.redhat.com/security/team/key
You can verify each package with the following command:
rpm --checksig -v
If you only wish to verify that each package has not been corrupted or
tampered with, examine only the md5sum with the following command:
md5sum
References
http://marc.theaimsgroup.com/?l=stunnel-users&m=105980139926784 http://marc.theaimsgroup.com/?l=stunnel-users&m=106221975232250 http://marc.theaimsgroup.com/?l=bugtraq&m=106260760211958 CVE -CVE-2002-1563 CVE -CVE-2003-0740
Package List
Topic
Topic
Updated stunnel packages are now available for Red Hat Linux 7.1, 7.2, 7.3,
and 8.0 systems. These updates address problems stemming from improper use
of non-reentrant functions in signal handlers.
Relevant Releases Architectures
Red Hat Linux 7.1 - i386
Red Hat Linux 7.2 - i386, ia64
Red Hat Linux 7.3 - i386
Red Hat Linux 8.0 - i386
Bugs Fixed
