Date: Wed, 18 May 2011 16:13:05 -0400 From: Dan Rosenberg <dan.j.rosenberg@...il.com> To: oss-security@...ts.openwall.com Cc: klibc@...or.com Subject: Re: [klibc] CVE request: klibc: ipconfig sh script with unescaped DHCP options Might it be worth fixing the insecure temporary file usage? 122 snprintf(fn, sizeof(fn), "/tmp/net-%s.conf", dev->name); 123 f = fopen(fn, "w"); What if someone else has already created that file, or put a symlink or hard link there? What if someone overwrites your string with command injection characters despite your stripping? -Dan On Wed, May 18, 2011 at 4:44 AM, maximilian attems <max@...o.at> wrote: > Related to CVE-2011-0997 > > ipconfig vulnerability for malicious dhcpd if $DNSDOMAIN is later > used unquoted, than proof of concept involves > DNSDOMAIN="\\\"\$(echo owned; touch /tmp/owned)" > > fix: > http://git.kernel.org/?p=libs/klibc/klibc.git;a=commit;h=46a0f831582629612f0ff9707ad1292887f26bff > will be part of the just to be released klibc-1.5.22 > > > -- > maks > > _______________________________________________ > klibc mailing list > klibc@...or.com > http://www.zytor.com/mailman/listinfo/klibc >
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