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Date: Tue, 20 Dec 2022 15:46:28 -0600
From: John Helmert III <ajak@...too.org>
To: oss-security@...ts.openwall.com
Cc: ovs-discuss <ovs-discuss@...nvswitch.org>, i.maximets@....org,
	Aaron Conole <aconole@...hat.com>,
	Qian Chen <cq674350529@...il.com>
Subject: Re: [ADVISORY] LLDP underflow while parsing malformed
 Auto Attach TLV (Open vSwitch)

On Tue, Dec 20, 2022 at 10:39:23PM +0100, Ilya Maximets wrote:
> Description
> ===========
> 
> Multiple versions of Open vSwitch are vulnerable to crafted LLDP
> packets causing denial of service, and data underflow attacks.
> Triggering the vulnerabilities requires LLDP processing to be enabled
> for a specific port.  Open vSwitch versions prior to 2.4.0 are not
> vulnerable.
> 
> The Common Vulnerabilities and Exposures project (cve.mitre.org)
> did not assign the identifier to this issue yet.  The identifier will
> be communicated separately.

Has a CVE been requested?

> This issue does not affect the `lldpd' project, although they share
> a code base.  The issue is related to parsing the Auto Attach TLVs,
> which is specific to the Open vSwitch implementation.
> 
> 
> Mitigation
> ==========
> 
> For any version of Open vSwitch, preventing LLDP packets from reaching
> Open vSwitch mitigates the vulnerability.  We do not recommend
> attempting to mitigate the vulnerability this way because of the
> following difficulties:
> 
>     - Open vSwitch obtains packets before the iptables host firewall,
>       so ebtables on the Open vSwitch host cannot ordinarily block the
>       vulnerability.
> 
>     - If Open vSwitch is configured to receive and transmit LLDP
>       messages, the required functionality will need to be disabled
>       potentially disrupting the network.
> 
> We have found that Open vSwitch is subject to a denial of service, and
> possibly a remote code execution exploit when LLDP processing is enabled
> on an interface.  By default, interfaces are not configured to process
> LLDP messages.
> 
> 
> Fix
> ===
> 
> Patches to fix these vulnerabilities in Open vSwitch 2.13.x and newer are
> applied to the appropriate branches, and the original patch is located
> at:
> 
>    https://mail.openvswitch.org/pipermail/ovs-dev/2022-December/400596.html
> 
> Recommendation
> ==============
> 
> We recommend that users of Open vSwitch apply the respective patch, or
> upgrade to a known patched version of Open vSwitch.  These include:
> 
> * 3.0.3
> * 2.17.5
> * 2.16.6
> * 2.15.7
> * 2.14.8
> * 2.13.10
> 
> 
> Acknowledgments
> ===============
> 
> The Open vSwitch team wishes to thank the reporter:
> 
>   Qian Chen <cq674350529@...il.com>
> 






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