Secunia Research Advisory

FreeBSD IPv6 Socket Flags Denial of Service Vulnerabilities


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                     Secunia Research 2018/09/28

     FreeBSD IPv6 Socket Flags Denial of Service Vulnerabilities
							  
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Table of Contents
 
Affected Software....................................................1
Severity.............................................................2
Description of Vulnerabilities.......................................3
Solution.............................................................4
Time Table...........................................................5
Credits..............................................................6
References...........................................................7
About Flexera .......................................................8
Verification.........................................................9

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1) Affected Software

* FreeBSD versions 11.2, 11.1, and 10.4.

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2) Severity

Rating: Not critical
Impact: Denial of Service
Where:  Local system

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3) Description of Vulnerabilities

Secunia Research has discovered multiple vulnerabilities in FreeBSD,
which can be exploited by malicious, local users to cause a DoS
(Denial of Service).

Multiple errors when handling IPv6 socket flags can be exploited to
cause a kernel crash.

The vulnerabilities are confirmed in versions 11.2-RELEASE-p2 and 
12.0-CURRENT and reported in versions 11.2, 11.1, and 10.4.

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4) Solution

Update FreeBSD or apply a patch.
https://www.freebsd.org/security/advisories/FreeBSD-EN-18:11.listen.asc
https://svnweb.freebsd.org/base?view=revision&revision=338980

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5) Time Table

2018/09/05 - FreeBSD team contacted with vulnerability details.
2018/09/05 - FreeBSD team supplied internal bug ticket ID.
2018/09/20 - FreeBSD team confirmed a fix is prepared.
2018/09/27 - Release of vendor patch.
2018/09/28 - Release of Secunia Advisory SA84444.
2018/09/28 - Public disclosure of Secunia Research Advisory.

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6) Credits
 
Jakub Jirasek, Secunia Research at Flexera.

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7) References

The FreeBSD CNA has assigned CVE-2018-6925 identifier for the
vulnerabilities through the Common Vulnerabilities and Exposures (CVE)
project.

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8) About Flexera

Flexera helps application producers and enterprises increase
application usage and the value they derive from their software.

https://www.flexera.com

Flexera delivers market-leading Software Vulnerability Management
solutions enabling enterprises to proactively identify and
remediate software vulnerabilities, effectively reducing the risk of
costly security breaches.

Flexera supports and contributes to the community in several
ways. We have always believed that reliable vulnerability
intelligence and tools to aid identifying and fixing vulnerabilities
should be freely available for consumers to ensure that users,
who care about their online privacy and security, can stay secure.
Only a few vendors address vulnerabilities in a proper way and help
users get updated and stay secure. End-users (whether private
individuals or businesses) are otherwise left largely alone, and
that is why back in 2002, Secunia Research started investigating,
coordinating disclosure and verifying software vulnerabilities.
In 2016, Secunia Research became a part of Flexera and today
our in-house software vulnerability research remains the core of
the Software Vulnerability Management products at Flexera.

The public Secunia Advisory database contains information for
researchers, security enthusiasts, and consumers to lookup individual
products and vulnerabilities and assess, whether they need to take
any actions to secure their systems or whether a given vulnerability
has already been discovered.

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9) Verification

Please verify this advisory by visiting the Secunia Research website:
https://www.flexera.com/about-us/secunia-research/advisories/sr-2018-21.html

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