Date: Mon, 26 Mar 2012 10:06:33 +0200 From: Ludwig Nussel <ludwig.nussel@...e.de> To: oss-security@...ts.openwall.com Subject: Re: CVE-Request taglib vulnerabilities Zubin Mithra wrote: > On Wed, Mar 21, 2012 at 10:49 PM, Kurt Seifried <kseifried@...hat.com>wrote: > >> On 03/21/2012 09:42 AM, Ludwig Nussel wrote: >>> Zubin Mithra wrote: >>>> [...] >>>> The issues which are present in the latest "release" but not in the >> current >>>> development head were :- >>>> >>>>  Lack of sanity checks of fields which were read, and were used for >>>> allocating memory; crafted files would lead of application crash. >>> >>> Not an issue according to upstream: >>> http://mail.kde.org/pipermail/taglib-devel/2012-March/002187.html >> >> Shouldn't it simply say "file to large" or "unable to allocate blah" >> something rather than crashing? I assume by "large" file the file >> doesn't actually need to be large, just the header information needs to >> claim it is large? >> > > Yes, the file does not need to be large, it just needs to have a crafted > header. > > On investigating the issue further, discussing with a developer Lukas > Laninsky and providing PoC's, we had confirmed that the root issue was an > Integer overflow - which would cause a large allocation and crash the > application. > > The changeset that corrects it can be found here => > https://github.com/taglib/taglib/commit/dcdf4fd954e3213c355746fa15b7480461972308 > >> >>>>  A one bit change in a working ogg file would cause a thread to loop >>>> infinitely. >>> >>> http://mail.kde.org/pipermail/taglib-devel/2012-March/002191.html >>> >> https://github.com/taglib/taglib/commit/b3646a07348ffa276ea41a9dae03ddc63ea6c532 >> >> Has this been confirmed? Does the looping thread actually cause a DoS, >> simply slow down the application a bit, or? >> > > Yes, it just causes a thread to cause an infinite loop and does not cause > an application crash. So both issues qualify as security issue and CVE assignment then, right? cu Ludwig -- (o_ Ludwig Nussel //\ V_/_ http://www.suse.de/ SUSE LINUX Products GmbH, GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer, HRB 16746 (AG Nürnberg)
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