Date: Thu, 04 Dec 2014 10:58:06 +0100 From: Florian Weimer <fweimer@...hat.com> To: oss-security@...ts.openwall.com, "Joshua J. Drake" <oss-sec-pmgetbl@...p.org> CC: Tero Marttila <terom@...me.fi> Subject: Re: CVE request: procmail heap overflow in getlline() On 12/04/2014 09:41 AM, Kurt Seifried wrote: > On 04/12/14 12:57 AM, Santiago Vila wrote: >> On Wed, Dec 03, 2014 at 05:30:57PM -0600, Joshua J. Drake wrote: >>> Is it possible to trigger this issue with untrusted input or only >>> trusted input from procmailrc? >> >> This is an issue with the handling of .procmailrc file, which contains >> the filter rules for procmail. An external attacker is not supposed to >> provide the .procmailrc file at /home/user, only the email to be >> filtered, so, IMHO, this is a bug but maybe not a security bug. >> >> Thanks. > > I disagree. Many mail servers allow people to edit their .procmailrc but > explicitly block shell accounts. This would allow a user with a non > interactive shell account to execute arbitrary commands using procmailrc > even if they were otherwise restricted (e.g. using permissions or > SELinux for example). procmail already executes commands in lines starting with “|” (and the documentation suggests it does not honor SHELL, so SHELL=/bin/false does not block this). If permissions/SELinux contain that, they will also work against a procmailrc parser exploit. In other words, I don't think there's a security bug here. -- Florian Weimer / Red Hat Product Security
Powered by blists - more mailing lists
Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.
Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.