|
PuTTY Authentication Process Buffer Overflow Vulnerabilities
|
|
Secunia Advisory:
|
SA12212
|
|
|
Release Date:
|
2004-08-04
|
|
Last Update:
|
2005-02-15
|
|
Popularity:
|
13,832 views
|
|
|
Critical:
|
Moderately critical
|
|
Impact:
|
System access
|
|
Where:
|
From remote
|
|
Solution Status:
|
Vendor Patch
|
|
| Software: | PuTTY 0.x
|
|
|
Subscribe:
|
Instant alerts on relevant vulnerabilities 
|
|
| CVE reference: | CVE-2004-1440
|
|
Description:
Core Security Technologies has discovered two vulnerabilities in PuTTY, which potentially can be exploited by malicious people to compromise a user's system.
1) A boundary error within the "modpow()" function can be exploited by passing an overly large value as a base for the modular exponentiation. This can e.g. be exploited during the initial SSH2 key exchange to cause a heap-based buffer overflow by sending a specially crafted packet.
Successful exploitation may allow execution of arbitrary code on a user's system but requires that a user has been tricked into connecting to a malicious server or a session can be intercepted in a MitM (Man-in-the-Middle) attack.
2) A boundary error within the "rsaencrypt()" function can e.g. be exploited during SSH1 key exchange to cause a heap-based buffer overflow by sending a specially crafted packet with a very small public key modulus.
Successful exploitation crashes the application but may potentially also allow execution of arbitrary code on a user's system. This requires that a user has been tricked into connecting to a malicious server or a session can be intercepted in a MitM (Man-in-the-Middle) attack.
The vulnerabilities affect version 0.54 and prior.
Solution:
Update to version 0.55.
http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html
Provided and/or discovered by:
Core Security Technologies
Changelog:
2004-08-05: Vendor provided more information.
2005-02-15: Added CVE reference.
Original Advisory:
Vendor:
http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-modpow.html
http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-ssh1-kex.html
Core Security Technologies:
http://www.coresecurity.com/common/showdoc.php?idx=417&idxseccion=10
|
|
|
Track this Secunia Advisory
|
Customers of the Secunia Vulnerability Intelligence solutions will automatically receive updates when new information regarding this advisory is released.
Read more about our Vulnerability Intelligence solutions and what they can do for you and your company.
|
|
|
About this Secunia Advisory
|
Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.
|
