CVE-2013-4206
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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 3.7.3-1 |
| sid | Fixed | 3.7.3-1 |
| forky | Fixed | 3.7.3-1 |
| bullseye | Fixed | 3.7.3-1 |
| bookworm | Fixed | 3.7.3-1 |
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| putty | putty | 0.45 | |
| putty | putty | 0.46 | |
| putty | putty | 0.47 | |
| putty | putty | 0.48 | |
| putty | putty | 0.49 | |
| putty | putty | 0.50 | |
| putty | putty | 0.51 | |
| putty | putty | 0.52 | |
| putty | putty | 0.53b | |
| putty | putty | 0.54 | |
| putty | putty | 0.55 | |
| putty | putty | 0.56 | |
| putty | putty | 0.57 | |
| putty | putty | 0.58 | |
| putty | putty | 0.59 | |
| putty | putty | 0.60 | |
| putty | putty | 0.61 | |
| putty | putty | 2010-06-01 | |
| simon_tatham | putty | {"endIncluding":"0.62"} | |
| simon_tatham | putty | 0.53 | |
References
- http://lists.opensuse.org/opensuse-updates/2013-08/msg00035.html
- http://secunia.com/advisories/54379
- http://secunia.com/advisories/54533
- http://svn.tartarus.org/sgt/putty/sshbn.c?sortby=date&r1=9977&r2=9976&pathrev=9977
- http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-modmul.html
- http://www.debian.org/security/2013/dsa-2736
- http://www.openwall.com/lists/oss-security/2013/08/06/11
- https://security-tracker.debian.org/tracker/CVE-2013-4206
CWEs
CWE-119
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.