CVE-2018-15599 Information

Description

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.

CVSS Vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Reference

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://old.reddit.com/r/blackhat/comments/97ywnm/openssh_username_enumeration/e4e05n2/

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

LOW

Availability Impact

NONE

Base Score

NONE

Base Severity

5.3