__________________________________________________________________ Squid Proxy Cache Security Update Advisory SQUID-2019:10 __________________________________________________________________ Advisory ID: SQUID-2019:10 Date: November 05, 2019 Summary: HTTP Request Splitting issue in HTTP message processing. Affected versions: Squid 3.0 -> 3.5.28 Squid 4.x -> 4.8 Fixed in version: Squid 4.9 __________________________________________________________________ http://www.squid-cache.org/Advisories/SQUID-2019_10.txt http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-18678 __________________________________________________________________ Problem Description: Due to incorrect message parsing Squid is vulnerable to an HTTP request splitting issue. __________________________________________________________________ Severity: This issue allows attackers to smuggle HTTP requests through frontend software to a Squid which splits the HTTP Request pipeline differently. The resulting Response messages corrupt caches between client and Squid with attacker controlled content at arbitrary URLs.. Effects are isolated to software between the attacker client and Squid. There are no effects on Squid itself, nor any upstream servers. __________________________________________________________________ Updated Packages: This bug is fixed by Squid version 4.9. In addition, a patch addressing this problem for the stable releases can be found in our patch archives: Squid 4: If you are using a prepackaged version of Squid then please refer to the package vendor for availability information on updated packages. __________________________________________________________________ Determining if your version is vulnerable: All Squid-2.x have not been checked. All Squid-3.x up to and including 3.5.28 are vulnerable. All Squid-4.x up to and including 4.8 are vulnerable. __________________________________________________________________ Workarounds: There are no workarounds for this vulnerability. __________________________________________________________________ Contact details for the Squid project: For installation / upgrade support on binary packaged versions of Squid: Your first point of contact should be your binary package vendor. If your install and build Squid from the original Squid sources then the squid-users@lists.squid-cache.org mailing list is your primary support point. For subscription details see . For reporting of non-security bugs in the latest STABLE release the squid bugzilla database should be used . For reporting of security sensitive bugs send an email to the squid-bugs@lists.squid-cache.org mailing list. It's a closed list (though anyone can post) and security related bug reports are treated in confidence until the impact has been established. __________________________________________________________________ Credits: This vulnerability was discovered by by Régis Leroy (regilero from Makina Corpus). Fixed by Amos Jeffries of Treehouse Networks Ltd. __________________________________________________________________ Revision history: 2019-07-24 11:52:51 UTC Initial Report 2019-09-11 02:52:52 UTC Patches Released 2019-11-04 13:43:22 UTC CVE Assignment __________________________________________________________________ END