| Name | 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. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DSA-2736-1 |
| Debian Bugs | 719070 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| filezilla (PTS) | bullseye | 3.52.2-3+deb11u1 | fixed |
| bookworm | 3.63.0-1+deb12u3 | fixed |
| sid, trixie | 3.68.0-1 | fixed |
| putty (PTS) | bullseye | 0.74-1+deb11u2 | fixed |
| bullseye (security) | 0.74-1+deb11u1 | fixed |
| bookworm | 0.78-2+deb12u2 | fixed |
| bookworm (security) | 0.78-2+deb12u1 | fixed |
| sid, trixie | 0.81-3 | fixed |
The information below is based on the following data on fixed versions.
Notes
[squeeze] - filezilla <no-dsa> (Minor issue)
[wheezy] - filezilla <no-dsa> (Minor issue)
http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-modmul.html