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.
References (5)
Core 5
Core References
Mailing List, Third Party Advisory x_refsource_misc
https://www.openwall.com/lists/oss-security/2021/08/18/2
Broken Link x_refsource_misc
https://listman.redhat.com/archives/libguestfs/2021-August/msg00083.html
Patch, Third Party Advisory x_refsource_misc
https://gitlab.com/nbdkit/nbdkit/-/commit/09a13dafb7bb3a38ab52eb5501cba786365ba7fd
Patch, Third Party Advisory x_refsource_misc
https://gitlab.com/nbdkit/nbdkit/-/commit/6c5faac6a37077cf2366388a80862bb00616d0d8
Issue Tracking, Patch, Third Party Advisory x_refsource_misc
https://bugzilla.redhat.com/show_bug.cgi?id=1994695
Scores
CVSS v3
3.1
EPSS
0.0008
EPSS Percentile
24.3%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
Details
CWE
CWE-924
Status
published
Products (2)
nbdkit_project/nbdkit
1.11.8 - 1.24.6
redhat/enterprise_linux
8.0 (2 CPE variants)
Published
Mar 02, 2022
Tracked Since
Feb 18, 2026