| Name | CVE-2021-3716 |
| Description | A flaw was found in nbdkit due to to improperly caching plaintext state across the STARTTLS encryption boundary. A MitM attacker could use this flaw to inject a plaintext NBD_OPT_STRUCTURED_REPLY before proxying everything else a client sends to the server, potentially leading the client to terminate the NBD session. The highest threat from this vulnerability is to system availability. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| nbdkit (PTS) | buster | 1.10.3-1 | fixed |
| bullseye | 1.24.1-2 | vulnerable |
| bookworm | 1.32.5-1 | fixed |
| trixie | 1.36.3-1 | fixed |
| sid | 1.38.1-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| nbdkit | source | stretch | (not affected) | | | |
| nbdkit | source | buster | (not affected) | | | |
| nbdkit | source | (unstable) | 1.26.5-1 | | | |
Notes
[bullseye] - nbdkit <no-dsa> (Minor issue)
[buster] - nbdkit <not-affected> (Vulnerable code introduced later)
[stretch] - nbdkit <not-affected> (Vulnerable code introduced later)
Introduced by: https://github.com/libguestfs/nbdkit/commit/eaa4c6e9a2c4bdb71aefdd4b1d865e7a9af606a8 (v1.11.8)
https://listman.redhat.com/archives/libguestfs/2021-August/msg00077.html