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PuTTY Authentication Process Buffer Overflow Vulnerabilities
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Secunia Advisory:
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SA12212
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Release Date:
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2004-08-04
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Last Update:
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2005-02-15
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Popularity:
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16,404 views
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Critical:
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Moderately critical
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Impact:
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System access
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Where:
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From remote
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Solution Status:
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Vendor Patch
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| Software: | PuTTY 0.x
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Secunia CVSS-2 Score:
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| Advisory Content (Page 1 of 3) | [ 1 ] [ 2 ] [ 3 ] | |
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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.
Change Page:
[ 1 ] [ 2 ] [ 3 ]
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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