OpenSSH CVE-2019-6109 Man in the Middle Security Bypass Vulnerability

Risk

Medium

Date Discovered

January 11, 2019

Description

OpenSSH is prone to a security-bypass vulnerability. Successfully exploiting this issue may allow attackers to bypass certain security restrictions and perform unauthorized actions by conducting a man-in-the-middle attack. This may lead to other attacks. OpenSSH 7.9 version is vulnerable; other versions may also be affected.

Technologies Affected

  • F5 Traffix SDC 4.4.0
  • F5 Traffix SDC 5.0.0
  • F5 Traffix SDC 5.1.0
  • OpenSSH OpenSSH 7.9
  • Oracle Fujitsu M10-1 Server XCP 2230
  • Oracle Fujitsu M10-1 Server XCP 2271
  • Oracle Fujitsu M10-1 Server XCP 2280
  • Oracle Fujitsu M10-1 Server XCP 2290
  • Oracle Fujitsu M10-1 Server XCP 2320
  • Oracle Fujitsu M10-1 Server XCP 2360
  • Oracle Fujitsu M10-1 Server XCP 3050
  • Oracle Fujitsu M10-1 Server XCP 3052
  • Oracle Fujitsu M10-1 Server XCP 3053
  • Oracle Fujitsu M10-1 Server XCP 3060
  • Oracle Fujitsu M10-4 Server XCP 2230
  • Oracle Fujitsu M10-4 Server XCP 2271
  • Oracle Fujitsu M10-4 Server XCP 2280
  • Oracle Fujitsu M10-4 Server XCP 2290
  • Oracle Fujitsu M10-4 Server XCP 2320
  • Oracle Fujitsu M10-4 Server XCP 2360
  • Oracle Fujitsu M10-4 Server XCP 3050
  • Oracle Fujitsu M10-4 Server XCP 3052
  • Oracle Fujitsu M10-4 Server XCP 3053
  • Oracle Fujitsu M10-4 Server XCP 3060
  • Oracle Fujitsu M10-4S Server XCP 2230
  • Oracle Fujitsu M10-4S Server XCP 2271
  • Oracle Fujitsu M10-4S Server XCP 2280
  • Oracle Fujitsu M10-4S Server XCP 2290
  • Oracle Fujitsu M10-4S Server XCP 2320
  • Oracle Fujitsu M10-4S Server XCP 2360
  • Oracle Fujitsu M10-4S Server XCP 3050
  • Oracle Fujitsu M10-4S Server XCP 3052
  • Oracle Fujitsu M10-4S Server XCP 3053
  • Oracle Fujitsu M10-4S Server XCP 3060
  • Oracle Fujitsu M12-1 Server XCP 2230
  • Oracle Fujitsu M12-1 Server XCP 2290
  • Oracle Fujitsu M12-1 Server XCP 2320
  • Oracle Fujitsu M12-1 Server XCP 2360
  • Oracle Fujitsu M12-1 Server XCP 3000
  • Oracle Fujitsu M12-1 Server XCP 3050
  • Oracle Fujitsu M12-1 Server XCP 3052
  • Oracle Fujitsu M12-1 Server XCP 3053
  • Oracle Fujitsu M12-1 Server XCP 3060
  • Oracle Fujitsu M12-2 Server XCP 2230
  • Oracle Fujitsu M12-2 Server XCP 2290
  • Oracle Fujitsu M12-2 Server XCP 2320
  • Oracle Fujitsu M12-2 Server XCP 2360
  • Oracle Fujitsu M12-2 Server XCP 3000
  • Oracle Fujitsu M12-2 Server XCP 3050
  • Oracle Fujitsu M12-2 Server XCP 3052
  • Oracle Fujitsu M12-2 Server XCP 3053
  • Oracle Fujitsu M12-2 Server XCP 3060
  • Oracle Fujitsu M12-2S Server XCP 2230
  • Oracle Fujitsu M12-2S Server XCP 2290
  • Oracle Fujitsu M12-2S Server XCP 2320
  • Oracle Fujitsu M12-2S Server XCP 2360
  • Oracle Fujitsu M12-2S Server XCP 3000
  • Oracle Fujitsu M12-2S Server XCP 3050
  • Oracle Fujitsu M12-2S Server XCP 3052
  • Oracle Fujitsu M12-2S Server XCP 3053
  • Oracle Fujitsu M12-2S Server XCP 3060
  • Redhat Enterprise Linux 5
  • Redhat Enterprise Linux 6
  • Redhat Enterprise Linux 7
  • SuSE Linux Enterprise Server 11 SP3 LTSS
  • SuSE Linux Enterprise Server 11 SP4
  • SuSE Linux Enterprise Server 12 GA
  • SuSE Linux Enterprise Server 12 SP3
  • SuSE Linux Enterprise Server 12-SP1
  • SuSE Linux Enterprise Server 12-SP2

Recommendations

Block external access at the network boundary, unless external parties require service.
If global access isn't needed, filter access to the affected computer at the network boundary. Restricting access to only trusted computers and networks might greatly reduce the likelihood of successful exploits.

Implement multiple redundant layers of security.
Use of multiple redundant layers of encryption may reduce exposure to this and other latent vulnerabilities.

Currently, we are not aware of any vendor-supplied patches. If you feel we are in error or if you are aware of more recent information, please mail us at: vuldb@securityfocus.com.

References

Credits

Harry Sintonen, F-Secure Corporation


© 1995- Symantec Corporation

Permission to redistribute this alert electronically is granted as long as it is not edited in any way unless authorized by Symantec Security Response. Reprinting the whole or part of this alert in any medium other than electronically requires permission from secure@symantec.com.

Disclaimer

The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.

Symantec, Symantec products, Symantec Security Response, and secure@symantec.com are registered trademarks of Symantec Corp. and/or affiliated companies in the United States and other countries. All other registered and unregistered trademarks represented in this document are the sole property of their respective companies/owners.