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Test ID:1.3.6.1.4.1.25623.1.0.702736
Category:Debian Local Security Checks
Title:Debian Security Advisory DSA 2736-1 (putty - several vulnerabilities)
Summary:Several vulnerabilities where discovered in PuTTY, a Telnet/SSH client;for X. The Common Vulnerabilities and Exposures project identifies the;following problems:;;CVE-2013-4206;Mark Wooding discovered a heap-corrupting buffer underrun bug in the;modmul function which performs modular multiplication. As the modmul;function is called during validation of any DSA signature received;by PuTTY, including during the initial key exchange phase, a;malicious server could exploit this vulnerability before the client;has received and verified a host key signature. An attack to this;vulnerability can thus be performed by a man-in-the-middle between;the SSH client and server, and the normal host key protections;against man-in-the-middle attacks are bypassed.;;CVE-2013-4207;It was discovered that non-coprime values in DSA signatures can;cause a buffer overflow in the calculation code of modular inverses;when verifying a DSA signature. Such a signature is invalid. This;bug however applies to any DSA signature received by PuTTY,;including during the initial key exchange phase and thus it can be;exploited by a malicious server before the client has received and;verified a host key signature.;;CVE-2013-4208;It was discovered that private keys were left in memory after being;used by PuTTY tools.;;CVE-2013-4852;Gergely Eberhardt from SEARCH-LAB Ltd. discovered that PuTTY is;vulnerable to an integer overflow leading to heap overflow during;the SSH handshake before authentication due to improper bounds;checking of the length parameter received from the SSH server. A;remote attacker could use this vulnerability to mount a local denial;of service attack by crashing the putty client.;;Additionally this update backports some general proactive potentially;security-relevant tightening from upstream.
Description:Summary:
Several vulnerabilities where discovered in PuTTY, a Telnet/SSH client
for X. The Common Vulnerabilities and Exposures project identifies the
following problems:

CVE-2013-4206
Mark Wooding discovered a heap-corrupting buffer underrun bug in the
modmul function which performs modular multiplication. As the modmul
function is called during validation of any DSA signature received
by PuTTY, including during the initial key exchange phase, a
malicious server could exploit this vulnerability before the client
has received and verified a host key signature. An attack to this
vulnerability can thus be performed by a man-in-the-middle between
the SSH client and server, and the normal host key protections
against man-in-the-middle attacks are bypassed.

CVE-2013-4207
It was discovered that non-coprime values in DSA signatures can
cause a buffer overflow in the calculation code of modular inverses
when verifying a DSA signature. Such a signature is invalid. This
bug however applies to any DSA signature received by PuTTY,
including during the initial key exchange phase and thus it can be
exploited by a malicious server before the client has received and
verified a host key signature.

CVE-2013-4208
It was discovered that private keys were left in memory after being
used by PuTTY tools.

CVE-2013-4852
Gergely Eberhardt from SEARCH-LAB Ltd. discovered that PuTTY is
vulnerable to an integer overflow leading to heap overflow during
the SSH handshake before authentication due to improper bounds
checking of the length parameter received from the SSH server. A
remote attacker could use this vulnerability to mount a local denial
of service attack by crashing the putty client.

Additionally this update backports some general proactive potentially
security-relevant tightening from upstream.

Affected Software/OS:
putty on Debian Linux

Solution:
For the oldstable distribution (squeeze), these problems have been fixed in
version 0.60+2010-02-20-1+squeeze2. This update also provides a fix for
CVE-2011-4607
, which was fixed for stable already.

For the stable distribution (wheezy), these problems have been fixed in
version 0.62-9+deb7u1.

For the unstable distribution (sid), these problems have been fixed in
version 0.63-1.

We recommend that you upgrade your putty packages.

CVSS Score:
6.8

CVSS Vector:
AV:N/AC:M/Au:N/C:P/I:P/A:P

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2013-4852
Debian Security Information: DSA-2736 (Google Search)
http://www.debian.org/security/2013/dsa-2736
http://svn.tartarus.org/sgt?view=revision&sortby=date&revision=9896
http://winscp.net/tracker/show_bug.cgi?id=1017
http://www.search-lab.hu/advisories/secadv-20130722
http://secunia.com/advisories/54379
http://secunia.com/advisories/54517
http://secunia.com/advisories/54533
SuSE Security Announcement: openSUSE-SU-2013:1347 (Google Search)
http://lists.opensuse.org/opensuse-updates/2013-08/msg00035.html
SuSE Security Announcement: openSUSE-SU-2013:1355 (Google Search)
http://lists.opensuse.org/opensuse-updates/2013-08/msg00041.html
Common Vulnerability Exposure (CVE) ID: CVE-2011-4607
http://seclists.org/oss-sec/2011/q4/499
http://seclists.org/oss-sec/2011/q4/500
Common Vulnerability Exposure (CVE) ID: CVE-2013-4206
http://www.openwall.com/lists/oss-security/2013/08/06/11
Common Vulnerability Exposure (CVE) ID: CVE-2013-4208
Common Vulnerability Exposure (CVE) ID: CVE-2013-4207
CopyrightCopyright (C) 2013 Greenbone Networks GmbH http://greenbone.net

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