Date: Mon, 02 Aug 2010 10:29:46 -1000 From: akuster <akuster@...sta.com> To: oss-security@...ts.openwall.com CC: Eugene Teo <eugeneteo@...nel.sg>, "Steven M. Christey" <coley@...us.mitre.org> Subject: Re: CVE-2010-2524 kernel: dns_resolver upcall security issue Eugene, So would it mean git commit 6103335de8afa5d780dcd512abe85c696af7b040 introduced the problem? - Armin On 08/01/2010 05:47 PM, Eugene Teo wrote: > CIFS has the ability to chase MS-DFS referrals. In order to do this it > has to be able to resolve hostnames into IP addresses. For this, it uses > the keys API to upcall to the cifs.upcall userspace helper. It then > resolves the name and hands the address back to the kernel. > > The dns_resolver upcall currently used by CIFS is susceptible to cache > stuffing. It's possible for a malicious user to stuff the keyring with > the results of a lookup, and then trick the server into mounting a > server of his choosing. > > I have assigned this with CVE-2010-2524. To be susceptible to this, you > need CONFIG_CIFS_DFS_UPCALL enabled. Interesting bug. > > https://bugzilla.redhat.com/CVE-2010-2524 > > Upstream commit: > http://git.kernel.org/linus/4c0c03ca54f72fdd5912516ad0a23ec5cf01bda7 > > Thanks, Eugene
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