Information disclosure in Dropbear



Risk Low
Patch available NO
Number of vulnerabilities 1
CVE-ID CVE-2018-15599
CWE-ID CWE-200
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
 Dropbear
Server applications / Remote management servers, RDP, SSH

Vendor Matt Johnston

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Information disclosure

EUVDB-ID: #VU14499

Risk: Low

CVSSv4.0: 5.5 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/U:Clear]

CVE-ID: CVE-2018-15599

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

Exploit availability: No

Description

The vulnerability allows a remote attacker to obtain potentially sensitive information.

The vulnerability exists in the recv_msg_userauth_request function, as defined in the svr-auth.c source code file due to the way fields in SSH_MSG_USERAUTH messages are handled based on username validity. A remote attacker can send an authentication request packet and access sensitive information, such as valid usernames. 

Mitigation

Cybersecurity Help is currently unaware of any solutions addressing the vulnerability.

Vulnerable software versions

Dropbear: 0.28 - 2018.76

CPE2.3 External links

https://lists.ucc.gu.uwa.edu.au/pipermail/dropbear/2018q3/002109.html


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.



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