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Insecure Library Loading
Moderately critical

PuTTY Authentication Process Buffer Overflow Vulnerabilities

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Release Date:  2004-08-04    Last Update:  2005-02-15    Views:  22,437

Secunia Advisory SA12212

Where:

From remote

Impact:

System access

Solution Status:

Vendor Patch

Software:

CVE Reference(s):

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.

Further details available to Secunia VIM customers

Provided and/or discovered by:
Core Security Technologies

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

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: PuTTY Authentication Process Buffer Overflow Vulnerabilities

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