FreeBSD : PuTTY -- memory corruption in terminal emulator's erase character handling (0cb0afd9-86b8-11e5-bf60-080027ef73ec)

This script is Copyright (C) 2015 Tenable Network Security, Inc.


Synopsis :

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

Description :

Ben Harris reports :

Versions of PuTTY and pterm between 0.54 and 0.65 inclusive have a
potentially memory-corrupting integer overflow in the handling of the
ECH (erase characters) control sequence in the terminal emulator.

To exploit a vulnerability in the terminal emulator, an attacker must
be able to insert a carefully crafted escape sequence into the
terminal stream. For a PuTTY SSH session, this must be before
encryption, so the attacker likely needs access to the server you're
connecting to. For instance, an attacker on a multi-user machine that
you connect to could trick you into running cat on a file they control
containing a malicious escape sequence. (Unix write(1) is not a vector
for this, if implemented correctly.)

Only PuTTY, PuTTYtel, and pterm are affected; other PuTTY tools do not
include the terminal emulator, so cannot be exploited this way.

See also :

http://www.nessus.org/u?b96f8398
http://www.nessus.org/u?06c4584b

Solution :

Update the affected package.

Risk factor :

Medium / CVSS Base Score : 4.3
(CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:P)

Family: FreeBSD Local Security Checks

Nessus Plugin ID: 86805 ()

Bugtraq ID:

CVE ID: CVE-2015-5309

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