Date: Wed, 24 Dec 2008 12:49:57 -0500 (EST) From: "Steven M. Christey" <coley@...us.mitre.org> To: oss-security@...ts.openwall.com cc: coley@...re.org Subject: Re: Re: CVE Request - roundcubemail On Wed, 17 Dec 2008, Florian Weimer wrote: > > I bet there's a chunk of these in various applications. I believe Perl > > has similar functionality. > > Not quite, the s///e operator uses a compile-time transformation for > the replacement expression, so it shouldn't be affected by this very > issue. > > \Q \E pairs are an issue in the pattern, not the replacement. > Mistakes in this area increase the attack surface by exposing the > regular expression compiler to potentially hostile input, and it may > lead to denial-of-service vulnerabilities because some implementations > do not cope well with certain patterns. Perhaps CWE-624 should be > split to reflect this? We'll take a closer look at it. I'm not exactly sure what you're saying here, though. Do you mean that if attackers can insert a \Q or \E into the pattern, then they might be able to effectively modify the pattern in unexpected ways? I could imagine how inserting a \E followed by something like "." would change the meaning of the regexp. - Steve
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