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Re: phppgadmin / CVE-2019-10784

On Thu, 2020-02-20 at 21:17 +0100, Ola Lundqvist wrote:
> Hi fellow LTS contributors
> I have started to look into CVE-2019-10784 for phppgadmin.
> After some thinking on how it would be possible to protect against this I'm
> starting to think about whether we really want to protect against this, and
> whether it is in fact possible at all?
> I have ideas on how we can reduce the attack possibilities but I cannot
> find any perfect solution to this.
> What we can do is to check that the User Agent provided Referrer string
> points to the location where it is installed. There are however a few
> disadvantages with this.
> 1) It relies on that the user agent always provide the referrer string. A
> problem is that it is an optional header.
> 2) I think there are situations where "-" is used as the referrer string
> and if we allow that the check is quite pointless.
> I do not think this is a way forward.

My understanding is that the Referer field is normally provided when
navigating within the same site, though some proxies may remove it.  It
is common practice to use the Referer field to protect against CSRF,
though it's not the most effective mitigation:


Ben Hutchings
Unix is many things to many people,
but it's never been everything to anybody.

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