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qmail Long SMTP Session Handling Vulnerability
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Secunia Advisory:
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SA10649
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Release Date:
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2004-01-16
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Popularity:
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13,279 views
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Critical:
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Not critical
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Impact:
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DoS
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Where:
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From remote
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Solution Status:
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Unpatched
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| Software: | qmail 1.x
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Description:
Georgi Guninski has reported a vulnerability in qmail, which can be exploited to crash the current SMTP session.
The vulnerability is caused due to errors in the handling of certain extremely large SMTP sessions (2 GB).
However, one specific attack vector seems to cause a buffer overflow, which overwrites certain structures in memory. Successful exploitation may therefore theoretically allow execution of arbitrary code on a vulnerable system. This has not been confirmed at present, though.
The vulnerability has been reported in version 1.03.
This advisory will be updated as more information becomes available.
Solution:
Set an adequate maximum restriction for message sizes (less than 2 GB).
Example:
echo [number_of_bytes] >/var/qmail/control/databytes
"qmail-smtpd" needs to be restarted for the above changes to take effect.
Provided and/or discovered by:
Georgi Guninski
Original Advisory:
http://www.guninski.com/qmailcrash.html
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About this Secunia Advisory
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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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