CVE-2018-15599

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.

Category

5.3
CVSS
Severity: Medium
CVSS 3.0 •
CVSS 2.0 •
EPSS 0.53%
Third-Party Advisory edu.au Third-Party Advisory edu.au Third-Party Advisory debian.org Third-Party Advisory reddit.com
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://matt.ucc.asn.au/dropbear/CHANGES
http://lists.ucc.gu.uwa.edu.au/pipermail/dropbear/2018q3/002109.html third party advisory mailing list
http://lists.ucc.gu.uwa.edu.au/pipermail/dropbear/2018q3/002108.html third party advisory mailing list
https://lists.debian.org/debian-lts-announce/2018/08/msg00026.html third party advisory mailing list
https://old.reddit.com/r/blackhat/comments/97ywnm/openssh_username_enumeration/e4e05n2/ third party advisory

Frequently Asked Questions

What is the severity of CVE-2018-15599?
CVE-2018-15599 has been scored as a medium severity vulnerability.
How to fix CVE-2018-15599?
To fix CVE-2018-15599, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2018-15599 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2018-15599 is being actively exploited. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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