CVE-2013-4207

Name	CVE-2013-4207
Description	Buffer overflow in sshbn.c in PuTTY before 0.63 allows remote SSH servers to cause a denial of service (crash) via an invalid DSA signature that is not properly handled during computation of a modular inverse and triggers the overflow during a division by zero by the bignum functionality, a different vulnerability than CVE-2013-4206.
Source	CVE (at NVD; oss-sec, fulldisc, OSVDB, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SuSE, Mageia, more)
References	DSA-2736-1
NVD severity	medium (attack range: remote)
Debian Bugs	719070
Debian/oldstable	package filezilla is vulnerable.
Debian/stable	package filezilla is vulnerable.
Debian/testing	not vulnerable.
Debian/unstable	not vulnerable.

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
filezilla (PTS)	squeeze	3.3.3-1	vulnerable
	wheezy	3.5.3-2	vulnerable
	jessie, sid	3.9.0.5-1	fixed
putty (PTS)	squeeze (security), squeeze	0.60+2010-02-20-1+squeeze2	fixed
	wheezy, wheezy (security)	0.62-9+deb7u1	fixed
	jessie	0.63-8	fixed
	sid	0.63-9	fixed

The information above is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
filezilla	source	(unstable)	3.7.3-1	low		719070
putty	source	(unstable)	0.63-1	medium
putty	source	squeeze	0.60+2010-02-20-1+squeeze2	medium	DSA-2736-1
putty	source	wheezy	0.62-9+deb7u1	medium	DSA-2736-1

Notes

[squeeze] - filezilla <no-dsa> (Minor issue)
[wheezy] - filezilla <no-dsa> (Minor issue)
http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-bignum-division-by-zero.html