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 corruption or code execution via a crafted DSA signature, which is not properly…
Does this matter?
Lower severity and a low EPSS score (2.50%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 2.0
- 6.8 MEDIUMAV:N/AC:M/Au:N/C:P/I:P/A:P
- EPSS
- 2.50% probability · 84th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-119
- Affected
- putty/putty · simon tatham/putty
- Source
- secalert@redhat.com
References
- http://lists.opensuse.org/opensuse-updates/2013-08/msg00035.html
- http://secunia.com/advisories/54379Vendor Advisory
- http://secunia.com/advisories/54533
- http://svn.tartarus.org/sgt/putty/sshbn.c?sortby=date&r1=9977&r2=9976&pathrev=9977Patch
- http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-modmul.htmlVendor Advisory
- http://www.debian.org/security/2013/dsa-2736
- http://www.openwall.com/lists/oss-security/2013/08/06/11
- http://lists.opensuse.org/opensuse-updates/2013-08/msg00035.html
- http://secunia.com/advisories/54379Vendor Advisory
- http://secunia.com/advisories/54533
- http://svn.tartarus.org/sgt/putty/sshbn.c?sortby=date&r1=9977&r2=9976&pathrev=9977Patch
- http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-modmul.htmlVendor Advisory
- http://www.debian.org/security/2013/dsa-2736
- http://www.openwall.com/lists/oss-security/2013/08/06/11
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.