Vulnerability 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.
CVSS Score
LOW
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Nbdkit Project | Nbdkit | >= 1.11.8, < 1.24.6 |
| Redhat | Enterprise Linux | 8.0 |
Related Weaknesses (CWE)
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1994695Issue TrackingPatchThird Party Advisory
- https://gitlab.com/nbdkit/nbdkit/-/commit/09a13dafb7bb3a38ab52eb5501cba786365ba7PatchThird Party Advisory
- https://gitlab.com/nbdkit/nbdkit/-/commit/6c5faac6a37077cf2366388a80862bb00616d0PatchThird 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
- https://bugzilla.redhat.com/show_bug.cgi?id=1994695Issue TrackingPatchThird Party Advisory
- https://gitlab.com/nbdkit/nbdkit/-/commit/09a13dafb7bb3a38ab52eb5501cba786365ba7PatchThird Party Advisory
- https://gitlab.com/nbdkit/nbdkit/-/commit/6c5faac6a37077cf2366388a80862bb00616d0PatchThird 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
FAQ
What is CVE-2021-3716?
CVE-2021-3716 is a vulnerability with a CVSS score of 3.1 (LOW). 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 befo...
How severe is CVE-2021-3716?
CVE-2021-3716 has been rated LOW with a CVSS base score of 3.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-3716?
Check the references section above for vendor advisories and patch information. Affected products include: Nbdkit Project Nbdkit, Redhat Enterprise Linux.