Auth bypass in OpenBSD OpenSSH
CVE-2007-2243
OpenSSH 4.6 and earlier, when ChallengeResponseAuthentication is enabled, allows remote attackers to determine the existence of user accounts by attempting to authenticate via S/KEY, which displays a different response if the user account exists, a similar issue to CVE-2001-1483.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v2 metric
CVSS v2 base score 5.0 (Medium). Vector: AV:N/AC:L/Au:N/C:P/I:N/A:N. This CVE predates CVSS v3 and has no v3 score from NVD.
EPSS exploit prediction
EPSS: 0.025 (83.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 84th percentile — 83.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.025 · newest: 0.025 · change: 0.000
Affected products
- OpenBSD OpenSSH — versions 1.2, 1.2.1, 1.2.2
Weakness classification (CWE)
Public proof-of-concept exploits
References
- lists.grok.org.uk/pipermail/full-disclosure/2007-April/053906.html (mailing-list)
- www.securityfocus.com/bid/23601 (vdb-entry)
- securityreason.com/securityalert/2631 (third-party-advisory)
- www.osvdb.org/34600 (vdb-entry)
- exchange.xforce.ibmcloud.com/vulnerabilities/33794 (vdb-entry)
- lists.grok.org.uk/pipermail/full-disclosure/2007-April/053951.html (mailing-list)
- security.netapp.com/advisory/ntap-20191107-0003/
Frequently asked questions
- What is CVE-2007-2243?
- CVE-2007-2243 is a vulnerability in OpenBSD OpenSSH, classified under Improper Authentication. Published 2007-04-25.
- Is CVE-2007-2243 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.