Date: Thu, 9 Jul 2015 13:47:55 -0700 From: Reed Black <reed@...afeword.org> To: oss-security@...ts.openwall.com Subject: Re: Squid HTTP proxy CVE request As I read this, issue #1 allows CONNECT requests to proceed that shouldn't otherwise. Is unsetting AllowTcpForwarding also sufficient for the "Determining if your version is vulnerable" section? On Mon, Jul 6, 2015 at 4:26 AM, Amos Jeffries <squid3@...enet.co.nz> wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Greetings, > > This months release of Squid HTTP proxy, version 3.5.6, contains fixes > for two security issues. > > > Issue #1: > > Due to incorrect handling of peer responses in a hierarchy of 2 or > more proxies remote clients (or scripts run on a client) are able to > gain unrestricted access through a gateway proxy to its backend proxy. > > If the two proxies have differing levels of security this could lead > to authentication bypass or unprivileged access to supposedly secure > resources. > > <http://www.squid-cache.org/Versions/v3/3.5/changesets/squid-3.5-13856.p > atch> > > All Squid up to and including 3.5.5 are vulnerable. > > (when published the advisory for this will be > <http://www.squid-cache.org/Advisories/SQUID-2015_2.txt>) > > > Issue #2: > > This is somewhat more obscure, and I am seeking clarification perhapse > more than assignment. > > Squid up to and including 3.5.5 are apparently vulnerable to DoS > attack from malicious clients using repeated TLS renegotiation > messages. This has not been verified as it also seems to require > outdated (0.9.8l and older) OpenSSL libraries. > > <http://www.squid-cache.org/Versions/v3/3.5/changesets/squid-3.5-13849.p > atch> > > CVE-2009-3555 was mentioned by the submitter, but that was clearly > assigned for server-initiated renegotiation. This Squid change is > specifically for the client-initiated renegotiation part of the TLS > protocol flaw. > > There may be some relevant CVE already assigned, although I've been > unable to find it. Only CVE-2011-1473 which is for the library itself > and disputed. > > So, is server software being assigned specific CVE (or a shared > generic one) for resolving this flaw? Please indicate which CVE Squid > announcements should mention (if any). > > > Thanks, > Amos Jeffries > Squid Software Foundation > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v2.0.22 (MingW32) > > iQIcBAEBAgAGBQJVmmXyAAoJEGvSOzfXE+nLLjMP/2qTXQODFIdE9zfL3ZQ8MRhZ > Edh4PNFxSkhvVyYn8kU6ZMg2jx7hiXXEfiP/Ilvo3XcY/eDWf64g+POgLX20X5jV > o/StXDKHvcZUargImliJb2W1nalIGw1iqBERs6qwfRJhK67MHPgGWwxHu/SFEWsM > Kk2GRlGlIM4H8g7FnsDvwAnAYweGm3+iSqZlQEaX5JOqem2M8qukGziQsc28yU4E > SU5YIwNltW563pQYD+UTerz5i24Dt086in1AvSEFiLfqAMq4o3AdcFK73RhBdKyY > yJJ0rKaz3o18vtru3I7soms8dmUI0mLxX6imPrBHOeSInjGbbRvPIU3g2WYpcdwF > o6/7Xbg8HB+9QORXINqzC02aBiIJf8blleBnUKJQt1JMhQkb8vXAW4wcHoKfKTPo > w9gyhwHgbBCYk0gSQ5CuIlaqPUEPAST0DiV0OIDHltjeLSq7vsq5zij9OKLxQdDJ > nemVr03jrPHELCvV6eKXT/UJj6X+vfpCJk+giQq6rXC8ikhTvpID1aU/xOGxNJGq > ig9ThwADl6RE2/cgjh7bnz1IPcG679V85uMbwPVTXU38XmhTyWQKjDdt5DuAdd6a > RUsheekgzf5Lhhcv7/wht/ecNxDbBKvW8o8fvMinn5j9c0GNSNXtGbp8QYlySFS9 > ycdNaJLFdIm8LnV5rNSW > =COJ4 > -----END PGP SIGNATURE----- >
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