FreeBSD : cURL -- out of bounds read (ccace707-a8d8-11e7-ac58-b499baebfeaf)

This script is Copyright (C) 2017 Tenable Network Security, Inc.


Synopsis :

The remote FreeBSD host is missing a security-related update.

Description :

The cURL project reports :

FTP PWD response parser out of bounds read

libcurl may read outside of a heap allocated buffer when doing FTP.

When libcurl connects to an FTP server and successfully logs in
(anonymous or not), it asks the server for the current directory with
the PWD command. The server then responds with a 257 response
containing the path, inside double quotes. The returned path name is
then kept by libcurl for subsequent uses.

Due to a flaw in the string parser for this directory name, a
directory name passed like this but without a closing double quote
would lead to libcurl not adding a trailing NUL byte to the buffer
holding the name. When libcurl would then later access the string, it
could read beyond the allocated heap buffer and crash or wrongly
access data beyond the buffer, thinking it was part of the path.

A malicious server could abuse this fact and effectively prevent
libcurl-based clients to work with it - the PWD command is always
issued on new FTP connections and the mistake has a high chance of
causing a segfault.

See also :

https://curl.haxx.se/docs/adv_20171004.html
http://www.nessus.org/u?459c4124

Solution :

Update the affected package.

Risk factor :

High

Family: FreeBSD Local Security Checks

Nessus Plugin ID: 103666 ()

Bugtraq ID:

CVE ID: CVE-2017-1000254

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