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Date: Wed, 18 Nov 2015 20:54:45 +0000
From: Tristan Cacqueray <tdecacqu@...hat.com>
To: oss-security@...ts.openwall.com
Cc: cve-assign@...re.org
Subject: Re: Re: CVE request for vulnerability in OpenStack
Glance
On 11/18/2015 02:11 PM, cve-assign@...re.org wrote:
>> Glance computes cryptographic signature using MD5 hash of the
>> image. By crafting a malicious image that produces a MD5 collision, a
>> Glance backend operator may subvert the signature verification process,
>> resulting in a corrupted image.
>
>> https://launchpad.net/bugs/1516031
>
> Use CVE-2015-8234.
>
Thank you.
> We're willing to let the OpenStack VMT have CVEs for mostly arbitrary
> types of issues that they want OpenStack customers to treat as
> vulnerabilities.
> http://specs.openstack.org/openstack/glance-specs/specs/liberty/image-signing-and-verification-support.html
> possibly suggests that the behavior represents an intended
> intermediate step of feature development: "An alternative to using the
> existing MD5 hash algorithm is to create a separate configurable hash
> for use with verifying/creating the signature. However, creating a
> separate hash negatively affects the performance, without providing
> much benefit. Note that since there are preferable hash algorithms to
> MD5 that are more secure, a separate change is being proposed to allow
> for the configuring of this hash algorithm. This will not be included
> as a part of this change, in the interest of having a straightforward
> initial implementation." If so, then we think vendors typically
> wouldn't want CVEs in these types of situations, unless the
> intermediate step actually made something worse than before the
> feature development started.
>
This is indeed a corner case, though since glance 11.0.0 is shipping a
broken image verification procedure, it seemed appropriate to assign
this bug a CVE number.
Regards,
--
Tristan Cacqueray
OpenStack Vulnerability Management Team
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