Date: Thu, 25 Sep 2014 20:15:46 +0400 From: Solar Designer <solar@...nwall.com> To: oss-security@...ts.openwall.com Cc: chet.ramey@...e.edu Subject: Re: CVE-2014-6271: remote code execution through bash On Thu, Sep 25, 2014 at 11:37:45AM -0400, Chet Ramey wrote: > On 9/24/14, 10:47 PM, Solar Designer wrote: > > While we're at it, I think it's preferable not to output error messages > > triggerable by untrusted input, e.g.: [...] > I disagree. It's important for a program -- not just the shell -- to tell > the user when it attempts to do something on his behalf and is unable to > do it. There's obviously a trade-off here. I agree that keeping the error messages is the right thing if we can keep them contained to local usage (and local attack) scenarios under typical setups. I think applying Florian's prefix-suffix patch will achieve that (besides its main goal of actually mitigating most attacks). What do you think of distros' going with Florian's prefix-suffix patch right now? I think it breaks function imports/exports between pre-patch and post-patch bash versions, but keeps them intact for patched versions. Right? If so, this sounds acceptable for immediate use by distros. Do you agree? Alexander
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