Debian update for openssh



| Updated: 2023-03-09
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2018-15473
CWE-ID CWE-388
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
 openssh (Debian package)
Operating systems & Components / Operating system package or component

Vendor Debian

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) User enumeration

EUVDB-ID: #VU14440

Risk: Medium

CVSSv4.0: 6.9 [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:A/U:Green]

CVE-ID: CVE-2018-15473

CWE-ID: CWE-388 - Error Handling

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to enumerate all accounts on the system.

The vulnerability exists due to a logical error in auth2-gss.c, auth2-hostbased.c, and auth2-pubkey.c files when processing authentication requests. A remote attacker can send a specially crafted chain of packets and monitor behavior of openssh server to determine presence of a valid username. The server will drop connection upon receiving a malformed authentication packets if the username is valid.

Mitigation

Update the affected package to version: 1:7.4p1-10+deb9u4, 1:7.9p1-4 or 1:6.7p1-5+deb8u7.

Vulnerable software versions

openssh (Debian package): 1:6.7p1-1 - 1:7.9p1-3

CPE2.3 External links

https://www.debian.org/security/2018/dsa-4280


Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, a fully functional exploit for this vulnerability is available.



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