Date: Mon, 11 Jul 2011 16:39:08 +0200 From: Ludwig Nussel <ludwig.nussel@...e.de> To: oss-security@...ts.openwall.com Cc: Solar Designer <solar@...nwall.com>, Michael Matz <matz@...e.de>, Thorsten Kukuk <kukuk@...e.de>, Andreas Jaeger <aj@...e.de>, Zefram <zefram@...h.org> Subject: Re: CVE request: crypt_blowfish 8-bit character mishandling Solar Designer wrote: > [...] > Also, it brings up the question: why merely use $2a$ running the new > code rather than fully emulate the bug even for newly set passwords, > which would make all passwords work, even on other networked machines? > Sure, that would be even nastier for security, so maybe you managed to > strike a balance well. But nevertheless the question is there. One of > your options results in full backwards compatibility at a security cost > (for the local system), but the other somehow chooses to strike a > balance between compatibility and security without achieving either of > these fully (for a network of systems). > > Maybe you can afford to drop BLOWFISH_2y to avoid those inconsistencies? > I imagine that people won't know to enable this option unless/until they > have already run into an issue anyway (that is, someone is already > unable to log in). At this point, they could likely upgrade the rest of > their networked systems as well... or downgrade this one. ;-( I'm not sure I understand what you are suggesting. Keep using the buggy algorithm for new passwords and keep storing them as 2a as long as BLOWFISH_2a2x is turned on? cu Ludwig -- (o_ Ludwig Nussel //\ V_/_ http://www.suse.de/ SUSE LINUX Products GmbH, GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer, HRB 16746 (AG Nürnberg)
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