(Mandrake Issues Fix) Re: Stunnel Leaked File Descriptor Lets Remote Authenticated Users Hijack the Stunnel Process
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SecurityTracker Alert ID: 1008302 |
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SecurityTracker URL: http://securitytracker.com/id/1008302
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CVE Reference:
CAN-2003-0740
(Links to External Site)
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Date: Nov 26 2003
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Impact:
Modification of system information, Modification of user information, User access via network
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Fix Available: Yes Vendor Confirmed: Yes
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Version(s): 3.24 and prior versions, 4.00
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Description:
A vulnerability was reported in Stunnel. A leaked file descriptor allows a remote authenticated user to hijack the Stunnel server process.
It is reported that certain versions of Stunnel leak file descriptors. In particular, the file descriptor returned by the listen function is leaked, according to the report.
A remote authenticated user (with shell-like access on the target system) can fork a process, send a signal to the stunnel process, and then select the leaked file descriptor and write to it to take control of the stunnel process.
A demonstration exploit is provided in the Source Message.
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Impact:
A remote authenticated user can take control of the stunnel process.
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Solution:
Mandrake has issued a fix.
Corporate Server 2.1:
77c752f98e0685dd677656e56b6a931c corporate/2.1/RPMS/stunnel-3.26-1.1.C21mdk.i586.rpm
45596e6e50ed995cf4b18f9bd7366828 corporate/2.1/SRPMS/stunnel-3.26-1.1.C21mdk.src.rpm
Corporate Server 2.1/x86_64:
f080fa4956c146a3e40dc05ae6dbefe8 x86_64/corporate/2.1/RPMS/stunnel-3.26-1.1.C21mdk.x86_64.rpm
45596e6e50ed995cf4b18f9bd7366828 x86_64/corporate/2.1/SRPMS/stunnel-3.26-1.1.C21mdk.src.rpm
Mandrake Linux 9.0:
6b3eec02f63aa0d7aa64fe79b62e3020 9.0/RPMS/stunnel-3.26-1.1.90mdk.i586.rpm
14afcc8f0257338107bc60e33919a465 9.0/SRPMS/stunnel-3.26-1.1.90mdk.src.rpm
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Vendor URL: www.stunnel.org/ (Links to External Site)
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Cause:
Resource error, State error
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Underlying OS:
Linux (Mandriva/Mandrake)
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Message History:
This archive entry is a follow-up to the message listed below.
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Source Message Contents
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Date: 25 Nov 2003 23:23:11 -0000
Subject: [Full-Disclosure] MDKSA-2003:108 - Updated stunnel packagess fix vulnerabilities
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
_______________________________________________________________________
Mandrake Linux Security Update Advisory
_______________________________________________________________________
Package name: stunnel
Advisory ID: MDKSA-2003:108
Date: November 25th, 2003
Affected versions: 9.0, Corporate Server 2.1
______________________________________________________________________
Problem Description:
A vulnerability was discovered in stunnel versions 3.24 and earlier,
as well as 4.00, by Steve Grubb. It was found that stunnel leaks a
critical file descriptor that can be used to hijack stunnel's services.
All users are encouraged to upgrade to these packages. Note that the
version of stunnel provided with Mandrake Linux 9.1 and above is not
vulnerable to this problem.
_______________________________________________________________________
References:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0740
http://marc.theaimsgroup.com/?l=bugtraq&m=106260760211958&w=2
______________________________________________________________________
Updated Packages:
Corporate Server 2.1:
77c752f98e0685dd677656e56b6a931c corporate/2.1/RPMS/stunnel-3.26-1.1.C21mdk.i586.rpm
45596e6e50ed995cf4b18f9bd7366828 corporate/2.1/SRPMS/stunnel-3.26-1.1.C21mdk.src.rpm
Corporate Server 2.1/x86_64:
f080fa4956c146a3e40dc05ae6dbefe8 x86_64/corporate/2.1/RPMS/stunnel-3.26-1.1.C21mdk.x86_64.rpm
45596e6e50ed995cf4b18f9bd7366828 x86_64/corporate/2.1/SRPMS/stunnel-3.26-1.1.C21mdk.src.rpm
Mandrake Linux 9.0:
6b3eec02f63aa0d7aa64fe79b62e3020 9.0/RPMS/stunnel-3.26-1.1.90mdk.i586.rpm
14afcc8f0257338107bc60e33919a465 9.0/SRPMS/stunnel-3.26-1.1.90mdk.src.rpm
_______________________________________________________________________
To upgrade automatically use MandrakeUpdate or urpmi. The verification
of md5 checksums and GPG signatures is performed automatically for you.
A list of FTP mirrors can be obtained from:
http://www.mandrakesecure.net/en/ftp.php
All packages are signed by MandrakeSoft for security. You can obtain
the GPG public key of the Mandrake Linux Security Team by executing:
gpg --recv-keys --keyserver www.mandrakesecure.net 0x22458A98
Please be aware that sometimes it takes the mirrors a few hours to
update.
You can view other update advisories for Mandrake Linux at:
http://www.mandrakesecure.net/en/advisories/
MandrakeSoft has several security-related mailing list services that
anyone can subscribe to. Information on these lists can be obtained by
visiting:
http://www.mandrakesecure.net/en/mlist.php
If you want to report vulnerabilities, please contact
security_linux-mandrake.com
Type Bits/KeyID Date User ID
pub 1024D/22458A98 2000-07-10 Linux Mandrake Security Team
<security linux-mandrake.com>
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_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.netsys.com/full-disclosure-charter.html
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