CVE-2021-3716
Last modified
CVE-2021-3716 is a low-severity vulnerability rated 3.1/10 on the CVSS scale. 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. EPSS estimates a 0.56% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Nbdkit Project | Nbdkit | >= 1.11.8, < 1.24.6 |
| Nbdkit Project | Nbdkit | >= 1.25.1, < 1.26.5 |
| Nbdkit Project | Nbdkit | >= 1.27.1, < 1.27.6 |
| Redhat | Enterprise Linux | 8.0 |
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1994695Issue Tracking, Patch, Third Party Advisory
- https://gitlab.com/nbdkit/nbdkit/-/commit/09a13dafb7bb3a38ab52eb5501cba786365ba7fdPatch, Third Party Advisory
- https://gitlab.com/nbdkit/nbdkit/-/commit/6c5faac6a37077cf2366388a80862bb00616d0d8Patch, Third Party Advisory
- https://www.openwall.com/lists/oss-security/2021/08/18/2Mailing List, Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1994695Issue Tracking, Patch, Third Party Advisory
- https://gitlab.com/nbdkit/nbdkit/-/commit/09a13dafb7bb3a38ab52eb5501cba786365ba7fdPatch, Third Party Advisory
- https://gitlab.com/nbdkit/nbdkit/-/commit/6c5faac6a37077cf2366388a80862bb00616d0d8Patch, Third Party Advisory
- https://www.openwall.com/lists/oss-security/2021/08/18/2Mailing List, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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