CVE-2010-5107

Publication date 7 March 2013

Last updated 6 June 2026

Ubuntu priority

Cvss 3 Severity Score

Description

The default configuration of OpenSSH through 6.1 enforces a fixed time limit between establishing a TCP connection and completing a login, which makes it easier for remote attackers to cause a denial of service (connection-slot exhaustion) by periodically making many new TCP connections.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
openssh	16.04 LTS xenial	Not affected
	15.10 wily	Not affected
	15.04 vivid	Not affected
	14.10 utopic	Not affected
	14.04 LTS trusty	Not affected
	13.10 saucy	Not affected
	13.04 raring	Not affected
	12.10 quantal	Ignored end of life
	12.04 LTS precise	Ignored
	11.10 oneiric	Ignored end of life
	10.04 LTS lucid	Ignored end of life
	8.04 LTS hardy	Ignored end of life

Notes

jdstrand

this is a long-standing problem with any server that limits connections. This requires conffile changes.

mdeslaur

Upstream has changed the default MaxStartups to 10:30:100 to mitigate this issue. Sysadmins can change the equivalent config locally. we will not be fixing this issue in Ubuntu 12.04 LTS, in environments where this is a concern, we suggest settings the MaxStartups value to 10:30:100 in the sshd_config file

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
openssh	Upstream: http://www.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/servconf.c?r1=1.234#rev1.234 Upstream: http://www.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/sshd_config.5?r1=1.156#rev1.156 Upstream: http://www.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/sshd_config?r1=1.89#rev1.89

Severity score breakdown

Parameter	Value
Base score	7.5 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H