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.
The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.
| Link | Tags |
|---|---|
| http://www.openwall.com/lists/oss-security/2013/08/06/11 | mailing list |
| http://secunia.com/advisories/54533 | third party advisory |
| http://www.debian.org/security/2013/dsa-2736 | vendor advisory |
| http://lists.opensuse.org/opensuse-updates/2013-08/msg00035.html | vendor advisory |
| http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-bignum-division-by-zero.html | vendor advisory |
| http://secunia.com/advisories/54379 | third party advisory vendor advisory |