CVE-2013-4207

NameCVE-2013-4207
DescriptionBuffer 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SuSE, Mageia, GitHub code/issues, web search, more)
ReferencesDSA-2736-1
NVD severitymedium (attack range: remote)
Debian Bugs719070

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
filezilla (PTS)wheezy3.5.3-2vulnerable
jessie3.9.0.5-1fixed
stretch3.20.0-1fixed
sid3.21.0-2fixed
putty (PTS)wheezy (security), wheezy0.62-9+deb7u3fixed
jessie (security), jessie0.63-10+deb8u1fixed
stretch, sid0.67-2fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
filezillasource(unstable)3.7.3-1low719070
puttysource(unstable)0.63-1medium
puttysourcesqueeze0.60+2010-02-20-1+squeeze2mediumDSA-2736-1
puttysourcewheezy0.62-9+deb7u1mediumDSA-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

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