Date: Wed, 12 May 2021 23:46:13 +0000 From: Qualys Security Advisory <qsa@...lys.com> To: harris.johnson.x <harris.johnson.x@...tonmail.com> CC: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com> Subject: Re: [CVE-2020-28018] Use-After-Free on Exim Question Hi, On Wed, May 12, 2021 at 02:46:31PM +0000, harris.johnson.x wrote: > R u guys using any specific technique to groom the heap / get the > chunk returned by store_get() on that struct? We first send a large EHLO command to make sure that the next allocation will overwrite the freed struct gstring, and then we send the MAIL FROM command (with an AUTH parameter) to actually overwrite the freed struct gstring (with arbitrary characters). Hopefully this helps! With best regards, -- the Qualys Security Advisory team [https://d1dejaj6dcqv24.cloudfront.net/asset/image/email-banner-384-2x.png]<https://www.qualys.com/email-banner> This message may contain confidential and privileged information. If it has been sent to you in error, please reply to advise the sender of the error and then immediately delete it. If you are not the intended recipient, do not read, copy, disclose or otherwise use this message. The sender disclaims any liability for such unauthorized use. NOTE that all incoming emails sent to Qualys email accounts will be archived and may be scanned by us and/or by external service providers to detect and prevent threats to our systems, investigate illegal or inappropriate behavior, and/or eliminate unsolicited promotional emails (“spam”). If you have any concerns about this process, please contact us.
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