| Name | CVE-2020-14002 |
| Description | PuTTY 0.68 through 0.73 has an Observable Discrepancy leading to an information leak in the algorithm negotiation. This allows man-in-the-middle attackers to target initial connection attempts (where no host key for the server has been cached by the client). |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-3794-1 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| putty (PTS) | jessie, jessie (lts) | 0.63-10+deb8u2 | fixed |
| stretch (security), stretch (lts), stretch | 0.67-3+deb9u1 | fixed |
| buster (security), buster, buster (lts) | 0.74-1+deb11u1~deb10u2 | fixed |
| 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.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| putty | source | wheezy | (not affected) | | | |
| putty | source | jessie | (not affected) | | | |
| putty | source | stretch | (not affected) | | | |
| putty | source | buster | 0.74-1+deb11u1~deb10u1 | | DLA-3794-1 | |
| putty | source | (unstable) | 0.74-1 | | | |
Notes
[stretch] - putty <no-dsa> (Minor issue)
[jessie] - putty <no-dsa> (Minor issue)
Introduced by: https://git.tartarus.org/?p=simon/putty.git;a=commit;h=d21041f7f8846b16ff6d72ed696d6190627e19b4 (0.68)
Fixed by: https://git.tartarus.org/?p=simon/putty.git;a=commit;h=08f1e2a5066ea95559945af339a60ca14560d764 (0.74)
[stretch] - putty <not-affected> (Vulnerable code introduced later)
[jessie] - putty <not-affected> (Vulnerable code introduced later)
[wheezy] - putty <not-affected> (Vulnerable code introduced later)