Date: Thu, 04 Dec 2014 11:26:17 +0100 From: Martino Dell'Ambrogio <tillo@...lo.ch> To: oss-security@...ts.openwall.com Subject: Re: CVE request: procmail heap overflow in getlline() For what is worth, I strongly believe this is a security bug for the same reason. As soon as there is an undocumented way to execute code, it will be impossible for a .procmailrc file generator to avoid execution of code. Workaround measures like security capabilities can not be taken into account as they are not implicit. Martino Dell'Ambrogio Security Auditor Web: http://www.tillo.ch/ Email: tillo@...lo.ch On 12/04/2014 10:58 AM, Florian Weimer wrote: > 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. > Download attachment "smime.p7s" of type "application/pkcs7-signature" (4234 bytes)
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