Date: Tue, 13 Sep 2022 09:55:29 -0500 From: John Helmert III <ajak@...too.org> To: oss-security@...ts.openwall.com, Carlos Alberto Lopez Perez <clopez@...lia.com> Subject: Re: WebKitGTK and WPE WebKit Security Advisory WSA-2022-0008 On Mon, Aug 29, 2022 at 01:26:49PM +0200, Carlos Alberto Lopez Perez wrote: > > On 26/08/2022 07:01, John Helmert III wrote: > > On Thu, Aug 25, 2022 at 11:34:04PM +0200, Carlos Alberto Lopez Perez wrote: > >> ------------------------------------------------------------------------ > >> WebKitGTK and WPE WebKit Security Advisory WSA-2022-0008 > >> ------------------------------------------------------------------------ > >> > >> Date reported : August 25, 2022 > >> Advisory ID : WSA-2022-0008 > >> WebKitGTK Advisory URL : https://webkitgtk.org/security/WSA-2022-0008.html > >> WPE WebKit Advisory URL : https://wpewebkit.org/security/WSA-2022-0008.html > >> CVE identifiers : CVE-2022-32893. > >> > >> Several vulnerabilities were discovered in WebKitGTK and WPE WebKit. > >> > >> CVE-2022-32893 > >> Versions affected: WebKitGTK and WPE WebKit before 2.36.7. > >> Credit to an anonymous researcher. > >> Impact: Processing maliciously crafted web content may lead to > >> arbitrary code execution. Apple is aware of a report that this issue > >> may have been actively exploited. > > > > According to Apple's security advisories for this (e.g. ), this > > issue is tracked on the Webkit Bugzilla as 243557  which was opened > > on 2022-08-04. A few minutes after that bug was opened, a pull request > > on GitHub was linked  with a patch which also seems to add unit > > tests. So, it appears to me that this issue was public since at least > > August 4th, and even more widely publicized with Apple's security > > advisories on August 17. > > > > WebKit-2.36.6 was released shortly after the first bug report, on > > 2022-08-07, and WebKit-2.36.7 was released yesterday, on 2022-08-25. > > > > With this bug seemingly being publicly known to be an actively > > exploited code execution issue, why did it take several weeks and 2 > > WebKit releases to get this issue fixed and a WSA released? > > > >  https://support.apple.com/en-us/HT213412 > >  https://bugs.webkit.org/show_bug.cgi?id=243557 > >  https://github.com/WebKit/WebKit/pull/3023 > > > > > We (maintainers of Linux WebKit ports) don't have access to the security > issues affecting Apple products until those issues are made public by them. > > So, we didn't knew until August 17th of this issue. Also you can see > that the bug report itself or the patch doesn't has any indication that > it fixes a security-related problem. Apple's released new security advisories yesterday, with 4 WebKit security fixes, two of which are code execution issues, but all 4 of which have public bugzilla bugs and public patches, since as early as late June (https://support.apple.com/en-us/HT213442): https://bugs.webkit.org/show_bug.cgi?id=242278 https://bugs.webkit.org/show_bug.cgi?id=241969 https://bugs.webkit.org/show_bug.cgi?id=242762 https://bugs.webkit.org/show_bug.cgi?id=243236 Is Apple fixing WebKit security issues in public while obfuscating the impact? This pattern seems to be potentially putting downstream WebKit users at a lot of risk, now that 2 code execution bugs (with patches!) are public (and have been for *months*, albeit without knowledge of security impact), and users need to wait weeks for remediation. > Therefore, the time it took us to notice the issue, backport the fix and > do a new release was just 7-8 days (from 17th to 24-25th of August). > Which, honestely, it is quite good taking into account that: 1) > back-porting the fix was not straightforward since it required > back-porting also a few previous patches in order to be able to merge it > properly and that 2) we are in August and people is usually on holidays. > > On the other hand, I don't know if this issue was or is exploited on > Linux WebKit users. All I known is that Apple said they are aware of a > report that this issue was actively exploited (on Apple/WebKit users). > So I assume this can also affect Linux WebKit users. But I don't have a > confirmation that this is actually the case, neither I'm aware of any > PoC demonstrating the issue. > > Regards. Download attachment "signature.asc" of type "application/pgp-signature" (229 bytes)
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