Summary ======= squid proxys ICAP adaptation is missing data flow control to client side. Thus blocking clients may cause a denial of service condition when requesting huge downloads. Affected Versions ================= All squid 3.x versions Not vulnerable ============== None of phions HTTP proxy services (in any version) is affected. Details ======= squids ICAP adaptation implementation does not check body-pipes buffer size before reading from an ICAP-server. If the client does not read from the open connection (i.e. the user does not confirm the browsers download-message-box in microsofts IE), squid keeps on reading data from the ICAP server into the body pipe, whilst no more data can be delivered to the client. Thus the body pipes buffer is growing and squid may - in worst case - consume memory up to the size of the users download. Details can be found on http://www.squid-cache.org/bugs/show_bug.cgi?id=2619 Workarounds =========== None except disabling content adaptation via ICAP. -- Martin Huter Unit Manager Release Manager phion AG Eduard-Bodem-Gasse 1 A-6020 Innsbruck Tel: +43 (0) 508 100 Fax: +43 (0) 508 100 20 Mail: m.huter@xxxxxxxxx Web: http://www.phion.com phion AG Vorsitzender des Aufsichtsrates: Dr. Karl Lamprecht Vorstand: Dr. Wieland Alge, Mag. Günter Klausner Sitz der Gesellschaft: 6020 Innsbruck, Österreich Handelsgericht Innsbruck Firmenbuch: 184392s UID-Nr:: ATU47509003
