CVE-2018-15599

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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
5.3 MEDIUM
NETWORK
LOW
NONE
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
mitreCNA
---
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CVEADP
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Base Score
CVSS 3.x
EPSS Score
Percentile: 64%
VendorProductVersion
debiandebian_linux
8.0
dropbear_ssh_projectdropbear_ssh
𝑥
≤ 2018.76
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
dropbear
bullseye
2020.81-3+deb11u2
fixed
bookworm
2022.83-1+deb12u2
fixed
sid
2024.86-1
fixed
trixie
2024.86-1
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
dropbear
noble
not-affected
mantic
not-affected
lunar
not-affected
kinetic
not-affected
jammy
not-affected
impish
not-affected
hirsute
not-affected
groovy
not-affected
focal
not-affected
eoan
not-affected
disco
not-affected
cosmic
ignored
bionic
needed
xenial
needed
trusty
dne
Common Weakness Enumeration
References
http://lists.ucc.gu.uwa.edu.au/pipermail/dropbear/2018q3/002108.html
http://lists.ucc.gu.uwa.edu.au/pipermail/dropbear/2018q3/002109.html
https://lists.debian.org/debian-lts-announce/2018/08/msg00026.html
https://matt.ucc.asn.au/dropbear/CHANGES
https://old.reddit.com/r/blackhat/comments/97ywnm/openssh_username_enumeration/e4e05n2/
http://lists.ucc.gu.uwa.edu.au/pipermail/dropbear/2018q3/002108.html
http://lists.ucc.gu.uwa.edu.au/pipermail/dropbear/2018q3/002109.html
https://lists.debian.org/debian-lts-announce/2018/08/msg00026.html
https://matt.ucc.asn.au/dropbear/CHANGES
https://old.reddit.com/r/blackhat/comments/97ywnm/openssh_username_enumeration/e4e05n2/