Re: Advisory: CVE-2014-9708: Appweb Web Server

[Gsunde Orangen <gsunde.orangen () gmail com>]

Thanks, Matthew, for having spotted this.
As only current versions of Appweb (4 & 5) have been addressed so far,
but legacy versions (see http://embedthis.com/appweb/download.html) were
not mentioned yet in https://github.com/embedthis/appweb/issues/413 :

- Appweb V3: vulnerable, too
-- Source code audit on Appweb 3.4.2:
The vulnerable code is not in the parseRange() function in
paks/http/httpLib.c, but similarly in http/request.c
-- Verified as vulnerable using a device with Appweb 3.4.1

- Appweb V2: not vulnerable
-- Source code audit on Appweb 2.4.4:
V2 was writtein in C++ (not C), the Range parser is in request.cpp and
handles invalid ranges correctly
-- Verified as not vulnerable using a device with Appweb 2.3.1

Gsunde


On 2015-03-28, 03:40 Matthew Daley wrote:
> Affected software: Appweb Web Server
> CVE ID: CVE-2014-9708
>
> Description: An HTTP request with a Range header of the form "Range:
> x=," (ie. with an empty range value) will cause a null pointer
> dereference, leading to a remotely-triggerable DoS.
>
> Fixed versions: 4.6.6, 5.2.1
> Bug entry: https://github.com/embedthis/appweb/issues/413
> Fix: 
> https://github.com/embedthis/appweb/commit/7e6a925f5e86a19a7934a94bbd6959101d0b84eb#diff-7ca4d62c70220e0e226e7beac90c95d9L17348
> Reported by: Matthew Daley
>
> - Matthew Daley