Fetchmail STARTTLS Remote Denial of Service Vulnerability

BID:48043

Info

Fetchmail STARTTLS Remote Denial of Service Vulnerability

Bugtraq ID: 48043
Class: Design Error
CVE: CVE-2011-1947
Remote: Yes
Local: No
Published: May 30 2011 12:00AM
Updated: Apr 13 2015 09:53PM
Credit: This issue has been reported by vendor.
Vulnerable: Slackware Linux 10.2
Slackware Linux 10.1
Slackware Linux 10.0
Slackware Linux 9.1
Slackware Linux 9.0
Slackware Linux 8.1
Slackware Linux 13.37 x86_64
Slackware Linux 13.37
Slackware Linux 13.1 x86_64
Slackware Linux 13.1
Slackware Linux 13.0 x86_64
Slackware Linux 13.0
Slackware Linux 12.2
Slackware Linux 12.1
Slackware Linux 12.0
Slackware Linux 11.0
Eric Raymond Fetchmail 6.3.17
Eric Raymond Fetchmail 6.3.16
Eric Raymond Fetchmail 6.3.13
Eric Raymond Fetchmail 6.3.12
Eric Raymond Fetchmail 6.3.11
Eric Raymond Fetchmail 6.3.10
Eric Raymond Fetchmail 6.3.9
Eric Raymond Fetchmail 6.3.8
+ Trustix Secure Linux 3.0.5
+ Trustix Secure Linux 3.0
Eric Raymond Fetchmail 6.3.7
Eric Raymond Fetchmail 6.3.6
Eric Raymond Fetchmail 6.3.5
Eric Raymond Fetchmail 6.3.4
Eric Raymond Fetchmail 6.3.3
Eric Raymond Fetchmail 6.3.2 rc4
Eric Raymond Fetchmail 6.3.2 rc3
Eric Raymond Fetchmail 6.3.2 rc2
Eric Raymond Fetchmail 6.3.2
Eric Raymond Fetchmail 6.3.1 -rc1
Eric Raymond Fetchmail 6.3.1
Eric Raymond Fetchmail 6.3 .0
Eric Raymond Fetchmail 6.3
Eric Raymond Fetchmail 6.2.9 -rc6
Eric Raymond Fetchmail 6.2.6 -pre7
Eric Raymond Fetchmail 6.2.5 .5
Eric Raymond Fetchmail 6.2.5 .4
Eric Raymond Fetchmail 6.2.5 .2
Eric Raymond Fetchmail 6.2.5 .1
Eric Raymond Fetchmail 6.2.5
+ MandrakeSoft Corporate Server 3.0 x86_64
+ MandrakeSoft Corporate Server 3.0
+ Mandriva Linux Mandrake 10.2 x86_64
+ Mandriva Linux Mandrake 10.2
+ Mandriva Linux Mandrake 10.1 x86_64
+ Mandriva Linux Mandrake 10.1
+ Redhat Fedora Core4
+ Redhat Fedora Core3
+ Ubuntu Ubuntu Linux 5.10 powerpc
+ Ubuntu Ubuntu Linux 5.10 i386
+ Ubuntu Ubuntu Linux 5.10 amd64
+ Ubuntu Ubuntu Linux 5.0 4 powerpc
+ Ubuntu Ubuntu Linux 5.0 4 i386
+ Ubuntu Ubuntu Linux 5.0 4 amd64
+ Ubuntu Ubuntu Linux 4.1 ppc
+ Ubuntu Ubuntu Linux 4.1 ia64
+ Ubuntu Ubuntu Linux 4.1 ia32
Eric Raymond Fetchmail 6.2.4
Eric Raymond Fetchmail 6.2.2
Eric Raymond Fetchmail 6.2 .0
Eric Raymond Fetchmail 6.1.3
+ OpenPKG OpenPKG Current
Eric Raymond Fetchmail 6.1 .0
+ EnGarde Secure Linux 1.0.1
+ MandrakeSoft Corporate Server 2.1 x86_64
+ MandrakeSoft Corporate Server 2.1
+ MandrakeSoft Single Network Firewall 7.2
+ Mandriva Linux Mandrake 9.0
+ Mandriva Linux Mandrake 8.2
+ Mandriva Linux Mandrake 8.1
+ Mandriva Linux Mandrake 8.0
+ Mandriva Linux Mandrake 7.2
Eric Raymond Fetchmail 6.0 .0
Eric Raymond Fetchmail 5.9.9
+ HP Secure OS software for Linux 1.0
Eric Raymond Fetchmail 6.3.6-rc4
Eric Raymond Fetchmail 6.3.6-rc3
Eric Raymond Fetchmail 6.3.6-rc2
Eric Raymond Fetchmail 6.3.6-rc1
Eric Raymond Fetchmail 6.3.2 rc1
Eric Raymond Fetchmail 6.3.19
Eric Raymond Fetchmail 6.3.18
Not Vulnerable: Eric Raymond Fetchmail 6.3.20

Discussion

Fetchmail STARTTLS Remote Denial of Service Vulnerability

Fetchmail is prone to a denial-of-service vulnerability because the application fails to properly handle SSL/TLS negotiation.

An attacker can exploit this issue to cause an application hang, denying service to legitimate users.

Fetchmail version 5.9.9 up to and including 6.3.19 are vulnerable.

Exploit / POC

Fetchmail STARTTLS Remote Denial of Service Vulnerability

Attackers can use readily available tools to exploit this issue.

References

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