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Candidate: CVE-2013-4206
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https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-4206
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http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-modmul.html
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Heap-based buffer underflow in the modmul function in sshbn.c in PuTTY
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before 0.63 allows remote SSH servers to cause a denial of service (crash)
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and possibly trigger memory corruption or code execution via a crafted DSA
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signature, which is not properly handled when performing certain
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bit-shifting operations during modular multiplication.
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upstream_putty: released (0.63)
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lucid_putty: ignored (reached end-of-life)
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precise_putty: released (0.62-6ubuntu0.1)
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quantal_putty: released (0.62-9ubuntu0.1)
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raring_putty: released (0.62-10ubuntu0.1)
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devel_putty: released (0.63-1)