Home/CVE/A flaw was found in nbdkit due to to improperly caching plaintext state across the STARTTLS encryption boundary. A MitM
CVE

CVE-2021-3716

A flaw was found in nbdkit due to to improperly caching plaintext state across the STARTTLS encryption boundary. A MitM

A flaw was found in nbdkit due 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.

LOW · CVSS 3.1 EPSS 0.00082
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-924Improper Enforcement of Message Integrity During Transmission in a Communication Channel
▤

Affected Products & Versions

4
nbdkit project nbdkit>= 1.11.8 and < 1.24.6
nbdkit project nbdkit>= 1.25.1 and < 1.26.5
nbdkit project nbdkit>= 1.27.1 and < 1.27.6
redhat enterprise linuxall versions
▣

Scoring & Timeline

3.1
LOW · CVSS v3.1 · secalert@redhat.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD02 Mar 2022 · 11:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
⚑

Vendor Advisories

4
msrcCVE-2021-3716
suse-csafopenSUSE-SU-2024:11078-1
rhsaRHSA-2022:1759Moderate
rhsaRHSA-2022:0397Low
🔗

References & Sources

5
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://bugzilla.redhat.com/show_bug.cgi?id=1994695Issue TrackingPatchThird Party Advisory
https://gitlab.com/nbdkit/nbdkit/-/commit/09a13dafb7bb3a38ab52eb5501cba786365ba7fdPatchThird Party Advisory
https://gitlab.com/nbdkit/nbdkit/-/commit/6c5faac6a37077cf2366388a80862bb00616d0d8PatchThird Party Advisory
https://listman.redhat.com/archives/libguestfs/2021-August/msg00083.htmlBroken Link
https://www.openwall.com/lists/oss-security/2021/08/18/2Mailing ListThird Party Advisory
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