Date: Wed, 13 Mar 2013 19:51:46 -0600 From: Kurt Seifried <kseifried@...hat.com> To: oss-security@...ts.openwall.com CC: "Christey, Steven M." <coley@...re.org> Subject: Re: CVE assignments for "weak" crypto (was CVE Request: MD5 used for Download verification) -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 03/12/2013 09:36 AM, Christey, Steven M. wrote: > All, > > This is an informal response, but I wanted to get something out > pretty quickly. > > For CVE, our default position is that "using MD5 for integrity > checking of downloads" is a security-hardening issue, and thus > should NOT receive a CVE ID. While MD5 may be "broken" from a > theoretical standpoint, and there have been some demonstrations of > collisions, and stronger options exist - I do not know of any > reliable means of efficiently generating a collision that would > also remain a functioning executable. There is also a strong > likelihood of debate as to which method is currently "strongest." This is timely: http://cr.yp.to/talks/2013.03.12/slides.pdf one quote: 2012.06.07 Stevens: "A chosen- prefix collision attack against MD5 has been used for Flame. More interestingly ... not our published chosen-prefix collision attack was used, but an entirely new and unknown variant." CrySyS: Flame file wavesup3.drv appeared in logs in 2007; Flame "may have been active for as long as five to eight years". - -- Kurt Seifried Red Hat Security Response Team (SRT) PGP: 0x5E267993 A90B F995 7350 148F 66BF 7554 160D 4553 5E26 7993 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.13 (GNU/Linux) iQIcBAEBAgAGBQJRQS0yAAoJEBYNRVNeJnmTDrgQANAgBLsmerQmvSEfkw8uxzKv 6tuooZs7/mZqhr1JzLu4IBndjqx+z4UyvRP+qSNJDbchUDO/LsZMItKXh3QzPQec dLBumidg2HorCseFhZev8C9MCRRzNPcH2N9BGdnE18C1gh5Ukv9Ks8IMLbH7vGDc LfB62ph8CvVawyfmC7WNfUpk+Nxi0GyRPcD0dGxjz6aSqMflqudMsDUM/D5yCmL8 Oyyj84IbMsH0zMcS3s7UhGgE7rzIN5u/0MS+fl+wFwDsq/7KR7gCyZ0RJ8+2S48R THWtATLD51b4PzDfZ/blzU3XUosPjVT1MY/66+ScOEfe8BAIXlZ2bYSVgUR5/T9L hP8+aqP7tCAzfSsrDTCjla5e16w7vClED3PQxGndpfxioVsgjgqLnqDQ6gDb2Ceo er+igl/JCA7KY3+OaItZ3l2oRBe3gbne5n3LTxa22t/pKVYyoBaxR5I3ht6hPMP9 JFLQDj/B5BKMXT2iGoNR9POvukrQ2vx8MfaNBUwXxqu+Ja4XJ4kK67gs7Z1bAIRX Kq8CjYmLzBQozA9zapJOI5sHNHSEkPiU4NG+Wal+6T+nj+OORBVjnwE1+jCss485 1uECwLOavdUBoMtiJfuTTNo5BkGj1euioKua2v5zdMemgpEeERPagmbxcMjNBJuJ Sl8BK2W8RdNncCor7yqZ =LnRh -----END PGP SIGNATURE-----
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