STunnel Client Negotiation Protocol Format String Vulnerability

BID:3748

Info

STunnel Client Negotiation Protocol Format String Vulnerability

Bugtraq ID: 3748
Class: Input Validation Error
CVE:
Remote: Yes
Local: No
Published: Dec 22 2001 12:00AM
Updated: Dec 22 2001 12:00AM
Credit: This vulnerability was originally discovered by Matthias Lange <[email protected]>, and announced via Bugtraq by Brian Hatch <[email protected]> on December 27, 2001.
Vulnerable: Stunnel Stunnel 3.21 c
Stunnel Stunnel 3.21 b
Stunnel Stunnel 3.21 a
Stunnel Stunnel 3.21
Stunnel Stunnel 3.19
+ Redhat Linux 7.2 ia64
 + Redhat Linux 7.2 i386
 Stunnel Stunnel 3.18
Stunnel Stunnel 3.17
Stunnel Stunnel 3.16
Stunnel Stunnel 3.15
Stunnel Stunnel 3.20
+ Mandriva Linux Mandrake 8.1 ia64
 + Mandriva Linux Mandrake 8.1
Not Vulnerable: Stunnel Stunnel 3.22
+ EnGarde Secure Community 2.0
+ EnGarde Secure Community 1.0.1
+ EnGarde Secure Professional 1.5
+ EnGarde Secure Professional 1.2
+ EnGarde Secure Professional 1.1
+ Sun Linux 5.0.7

Discussion

STunnel Client Negotiation Protocol Format String Vulnerability

Stunnel is a freely available, open source cryptography wrapper. It is designed to wrap arbitrary protocols that may or may not support cryptography. It is maintained by the Stunnel project.

Stunnel does not properly handle unexpected input by users. When a protocol is initiated between a client and the server, it is possible to supply a format string to the Stunnel server that may result in the execution of arbitrary code.

Exploit / POC

STunnel Client Negotiation Protocol Format String Vulnerability

Exploit code has been published:

Solution / Fix

STunnel Client Negotiation Protocol Format String Vulnerability

Solution:
Updates available:


Stunnel Stunnel 3.20

Stunnel Stunnel 3.15

Stunnel Stunnel 3.16

Stunnel Stunnel 3.17

Stunnel Stunnel 3.18

Stunnel Stunnel 3.19

Stunnel Stunnel 3.21

Stunnel Stunnel 3.21 c

Stunnel Stunnel 3.21 b

Stunnel Stunnel 3.21 a

References

STunnel Client Negotiation Protocol Format String Vulnerability

References:

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