Unscored severity · published Aug 19, 2013
CVE-2013-4206
Heap-based buffer underflow in the modmul function in sshbn.c in PuTTY before 0.63 allows remote SSH servers to cause a denial of service (crash) and possibly trigger memory…
–
CVSS
2.5%
EPSS
No
On KEV
Description
Heap-based buffer underflow in the modmul function in sshbn.c in PuTTY before 0.63 allows remote SSH servers to cause a denial of service (crash) and possibly trigger memory corruption or code execution via a crafted DSA signature, which is not properly handled when performing certain bit-shifting operations during modular multiplication.
Exploitation
Is it being used?
Exploit prediction (EPSS)2.5% · higher than 84% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PU
Putty · Putty
0.45; 0.46; 0.47; 0.48; 0.49; 0.50; +12 more · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2013-4206
CVE.org
https://www.cve.org/CVERecord?id=CVE-2013-4206
lists.opensuse.org
http://lists.opensuse.org/opensuse-updates/2013-08/msg00035.html
Vendor Advisory
http://secunia.com/advisories/54379
secunia.com
http://secunia.com/advisories/54533
Patch
http://svn.tartarus.org/sgt/putty/sshbn.c?sortby=date&r1=9977&r2=9976&pathrev=9977
Vendor Advisory
http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-modmul.html
www.debian.org
http://www.debian.org/security/2013/dsa-2736
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