Published:2012/10/31  Last Updated:2012/10/31

Mac OS X OpenSSH vulnerable to denial-of-service (DoS)


The OpenSSH implementation in Mac OS X is vulnerable to denial-of-service.

Products Affected

  • Mac OS X versions prior to 10.6


The OpenSSH implementation in Mac OS X is vulnerable to denial-of-service.


A remote attacker may cause a denial-of-service.


Update the software
Update to the latest version according to the information provided by the developer.

According to the developer, versions Mac OS X 10.6 and later are not affected by this vulnerability.

Vendor Status

Vendor Link
Apple Apple - Mac


JPCERT/CC Addendum

This JVN publication was delayed to 2012/10/31 after the developer fix was developed. From the fiscal year 2011, JPCERT/CC is using a new vendor coordination procedure. This new procedure came from the recommendation of the fiscal year 2010 "Study Group on Information System Vulnerability Handling" aimed at more timely JVN publications.

Vulnerability Analysis by JPCERT/CC

Analyzed on 2012.10.31

Measures Conditions Severity
Access Required can be attacked over the Internet using packets
  • High
Authentication anonymous or no authentication (IP addresses do not count)
  • High
User Interaction Required the vulnerability can be exploited without an honest user taking any action
  • High
Exploit Complexity some expertise and/or luck required (most buffer overflows, guessing correctly in small space, expertise in Windows function calls)
  • Mid-High

Description of each analysis measures


MASAKI KATAYAMA of Appirits inc Cyber Security Laboratory reported this vulnerability to IPA.
JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.

Other Information

JPCERT Reports
CERT Advisory
CPNI Advisory
JVN iPedia JVNDB-2012-000095