Date: Tue, 7 Apr 2009 13:59:25 -0500 From: Steven French <sfrench@...ibm.com> To: Eugene Teo <eugene@...hat.com> Cc: Marcus Meissner <meissner@...e.de>, oss-security@...ts.openwall.com, security@...nel.org Subject: Re: CVE request? buffer overflow in CIFS in 2.6.* Yes - the NativeFileSystem field is part of a server generated response and is typically tiny ("NTFS" for example). As soon as Suresh (or his coworkers at Novell) have a patch - we (Jeff and I etc.) will review it. I think fixing these conversions to be cleaner is important, although the risk of exploitable overflow is small in practice. Steve French Senior Software Engineer Linux Technology Center - IBM Austin phone: 512-838-2294 email: sfrench at-sign us dot ibm dot com Eugene Teo <eugene@...hat.com> 04/07/2009 12:41 AM To Marcus Meissner <meissner@...e.de> cc oss-security@...ts.openwall.com, security@...nel.org, Steven French/Austin/IBM@...US Subject Re: [oss-security] CVE request? buffer overflow in CIFS in 2.6.* Hi Marcus, Marcus Meissner wrote: > Fixes a kmalloc area overflow in CIFS, number of overwritten bytes > is depending on the codepage converted to. > > The data seems to come from a remote generated reply blob even, correct > me if I am wrong. :/ Looks like it's part of the session setup. The NativeFileSystem field is part of the Tree Connect response (TCon for short). > And I wonder if "len*2" is sufficient, can't a UCS -> UTF8 conversion > generate more than 2 byte utf-8 characters for 1 ucs character? I understand that someone from your side is working on a better patch for this. Do keep us updated when it goes upstream. Thanks, Eugene -- Eugene Teo / Red Hat Security Response Team
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