Vulnerability CVE-2021-3716
Published: 2022-03-02   Modified: 2022-03-03

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.

Type:

CWE-924

CVSS2 => (AV:N/AC:M/Au:S/C:N/I:N/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
3.5/10
2.9/10
6.8/10
Exploit range
Attack complexity
Authentication
Remote
Medium
Single time
Confidentiality impact
Integrity impact
Availability impact
None
None
Partial
Affected software
Redhat -> Enterprise linux 
Nbdkit project -> Nbdkit 

 References:
https://www.openwall.com/lists/oss-security/2021/08/18/2
https://gitlab.com/nbdkit/nbdkit/-/commit/09a13dafb7bb3a38ab52eb5501cba786365ba7fd
https://gitlab.com/nbdkit/nbdkit/-/commit/6c5faac6a37077cf2366388a80862bb00616d0d8
https://listman.redhat.com/archives/libguestfs/2021-August/msg00083.html
https://bugzilla.redhat.com/show_bug.cgi?id=1994695
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