cve/2018/CVE-2018-15599.md

### [CVE-2018-15599](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-15599)
![](https://img.shields.io/static/v1?label=Product&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=n%2Fa&color=brighgreen)

### 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.

### POC

#### Reference
- http://lists.ucc.gu.uwa.edu.au/pipermail/dropbear/2018q3/002108.html
- https://old.reddit.com/r/blackhat/comments/97ywnm/openssh_username_enumeration/e4e05n2/

#### Github
- https://github.com/ARPSyndicate/cvemon
- https://github.com/odolezal/silvercrest_zigbee_gateway
- https://github.com/xtaran/dist-detect