Date: Fri, 18 Sep 2015 12:58:26 +1200 From: Amos Jeffries <squid3@...enet.co.nz> To: oss-security@...ts.openwall.com, cve-assign@...re.org Subject: CVE Request: Squid HTTP Proxy Denial of Service -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi, The TLS/SSL parser in the latest series of Squid HTTP Proxy has been found to have several bugs leading to Denial of Service possibilities. Can CVE be assigned as appropriate please? Vulnerable versions are 22.214.171.124 to 3.5.8 (inclusive), which are built with OpenSSL and configured for "SSL-Bump" decryption. Integer overflows can lead to invalid pointer math reading from random memory on some CPU architectures. In the best case this leads to wrong TLS extensiosn being used for the client, worst-case a crash of the proxy terminating all active transactions. Fixed by <http://www.squid-cache.org/Versions/v3/3.5/changesets/squid-3.5-13914.p atch>. Incorrect message size checks and assumptions about the existence of TLS extensions in the SSL/TLS handshake message can lead to very high CPU consumption (up to and including 'infinite loop' behaviour). Fixed by <http://www.squid-cache.org/Versions/v3/3.5/changesets/squid-3.5-13915.p atch>. The above can be triggered remotely. Though there is one layer of authorization applied before this processing to check that the client is allowed to use the proxy, that check is generally weak. MS Skype on Windows XP is known to trigger some of these. (Formal release with advisory will be coming in a few days. 3.5.9 tarballs are available now, via FTP if the web mirrors ). Amos Jeffries Squid Software Foundation -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (MingW32) iQIcBAEBAgAGBQJV+2GbAAoJEGvSOzfXE+nLUXAP+QHtjtge8w2NfIUPvHxugp6I lB7tcmNU2CIbA7Ocgd49Hyz0mgVyv3eTi5ZPoa9qamyU8h4YuKYMSG3dW1O3VRGo +CDahX3BnoXp1XkXnkfg/35icUzxSj2G3JdTlk6SKe5T/sVmfOObcq1DXUqN//xR DH4k5BSe69m/4WJ+rgddkGwSfkrk/n4+SiuhmbRD8NP0qfpnJG+wyp07WKZ7L4/7 FIK+zlk9oWYaibNMEUMzC1cxfa2veAkBcXEfFIxUkjGTapdlYrZKlV/QTSRp5nuo LCsluMie9Yz+CPHEg6ZaVfzc1t92+tA87OgvTdW7rS8kA65T9YZ8v2EEudnMDcfd +Vh3TzcW3vntw8AafcB4zpJZFtqo3kN+2amN585hQYcCgElImn18yfsvs4KeDKK4 xaOnPoDsaFUXgw6gSmaEUXBbR0Xvg2Gf0f4wt4VSQQg/uZY9g3peLmxInsaAZRtQ ExQx7AgRF1dUq5qBQFBIovKcuYUACKX1voBrTD3UVPTZECmpS8ofUNJn48T0EIij n9OksIAQyi1zRg4Phyh8hJy/Jh7HDeLJI56LGI5a6PCpMd3c8+lKifATrzzht0ih CrFVBytxW3um10GSxUo95fr1ZAJr096QmfIZWxNnRj0M+g8kHxoSW7spsiZ79ZMt h8mCSUBX9NdWxJje7VMM =Dyqj -----END PGP SIGNATURE-----
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