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Remote Buffer Overflow in Resolver Code of libc
27 June 2002
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From: Mark Lastdrager <mark@pine.nl>

Pine Internet Security Advisory

Advisory ID : PINE-CERT-20020601
Authors : Joost Pol <joost@pine.nl>
Issue date : 2002-06-25
Application : Multiple
Version(s) : Multiple
Platforms : FreeBSD, OpenBSD, NetBSD, maybe more.
Availability : http://www.pine.nl/advisories/pine-cert-20020601.txt

Synopsis

There is a remote buffer overflow in the resolver code of libc.

Impact

Serious.

Exploitability will vary on application-specific issues.

Description

There is a slight mistake in the resolver code of libc.

This will allow an attacker-controlled DNS server to reply with a carefully crafted message to (for example) a gethostbyname request.

This reply will trigger the buffer overflow

Solution

FreeBSD, NetBSD and OpenBSD CVS have been updated.


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