CVE-2018-15599: Infoleak
First published: Tue Aug 21 2018(Updated: )
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.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Debian GNU/Linux | =8.0 | |
| Dropbear SSH | <=2018.76 |
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Reference Links
- 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/
Frequently Asked Questions
What is the severity of CVE-2018-15599?
CVE-2018-15599 is classified as a user enumeration vulnerability which can be exploited to determine valid usernames.
How do I fix CVE-2018-15599?
To mitigate CVE-2018-15599, upgrade to Dropbear SSH version 2018.77 or later.
Which software is affected by CVE-2018-15599?
CVE-2018-15599 affects Dropbear SSH versions up to and including 2018.76 and Debian Linux 8.0.
What is the impact of CVE-2018-15599?
The impact of CVE-2018-15599 allows attackers to infer the validity of usernames based on SSH_MSG_USERAUTH message handling.
Is CVE-2018-15599 related to other vulnerabilities?
CVE-2018-15599 has similarities to CVE-2018-15473, as both involve user enumeration in different contexts.
- agent/type
- collector/mitre-cve
- source/MITRE
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- agent/last-modified-date
- agent/weakness
- agent/description
- agent/first-publish-date
- agent/event
- agent/source
- agent/softwarecombine
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- collector/nvd-index
- agent/software-canonical-lookup-request
- vendor/debian
- canonical/debian gnu/linux
- version/debian gnu/linux/8.0
- vendor/dropbear ssh project
- canonical/dropbear ssh
- version/dropbear ssh/2018.76