CVE-2018-15599

moderate-risk
Published 2018-08-21

The recv_msg_userauth_request function in svr-auth.c in Dropbear through 2018.76 is prone to a user enumeration vulnerability because username validity affects how fields in SSH_MSG_USERAUTH messages are handled, a similar issue to CVE-2018-15473 in an unrelated codebase.

Do I need to act?

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0.52% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.3/10 Medium
NETWORK / LOW complexity

Affected Products (2)

Affected Vendors

Debian Dropbear Ssh Project

References (10)

Mailing List http://lists.ucc.gu.uwa.edu.au/pipermail/dropbear/2018q3/002108.html
Mailing List http://lists.ucc.gu.uwa.edu.au/pipermail/dropbear/2018q3/002109.html
Mailing List https://lists.debian.org/debian-lts-announce/2018/08/msg00026.html
https://matt.ucc.asn.au/dropbear/CHANGES
Third Party Advisory https://old.reddit.com/r/blackhat/comments/97ywnm/openssh_username_enumeration/e...
Mailing List http://lists.ucc.gu.uwa.edu.au/pipermail/dropbear/2018q3/002108.html
Mailing List http://lists.ucc.gu.uwa.edu.au/pipermail/dropbear/2018q3/002109.html
Mailing List https://lists.debian.org/debian-lts-announce/2018/08/msg00026.html
https://matt.ucc.asn.au/dropbear/CHANGES
Third Party Advisory https://old.reddit.com/r/blackhat/comments/97ywnm/openssh_username_enumeration/e...
30
/ 100
moderate-risk
Severity 21/34 · High
Exploitability 2/34 · Minimal
Exposure 7/34 · Low