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squid: DoS (100% CPU use) while processing certain external ACL helper HTTP headers

🗓️ 29 Mar 2010 12:00:00Reported by RedHatType 
redhat
 redhat
🔗 access.redhat.com👁 6 Views

Denial of service via crafted auth header in external helper causing infinite loop in strcspn.

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Packages
Refs
OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux5i386squid7:2.6.STABLE21-6.el5squid-7:2.6.STABLE21-6.el5.i386.rpm
Red Hat Enterprise Linux5ia64squid7:2.6.STABLE21-6.el5squid-7:2.6.STABLE21-6.el5.ia64.rpm
Red Hat Enterprise Linux5ppcsquid7:2.6.STABLE21-6.el5squid-7:2.6.STABLE21-6.el5.ppc.rpm
Red Hat Enterprise Linux5s390xsquid7:2.6.STABLE21-6.el5squid-7:2.6.STABLE21-6.el5.s390x.rpm
Red Hat Enterprise Linux5x86_64squid7:2.6.STABLE21-6.el5squid-7:2.6.STABLE21-6.el5.x86_64.rpm
Red Hat Enterprise Linux5i386squid-debuginfo7:2.6.STABLE21-6.el5squid-debuginfo-7:2.6.STABLE21-6.el5.i386.rpm
Red Hat Enterprise Linux5ia64squid-debuginfo7:2.6.STABLE21-6.el5squid-debuginfo-7:2.6.STABLE21-6.el5.ia64.rpm
Red Hat Enterprise Linux5ppcsquid-debuginfo7:2.6.STABLE21-6.el5squid-debuginfo-7:2.6.STABLE21-6.el5.ppc.rpm
Red Hat Enterprise Linux5s390xsquid-debuginfo7:2.6.STABLE21-6.el5squid-debuginfo-7:2.6.STABLE21-6.el5.s390x.rpm
Red Hat Enterprise Linux5x86_64squid-debuginfo7:2.6.STABLE21-6.el5squid-debuginfo-7:2.6.STABLE21-6.el5.x86_64.rpm
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25 Jun 2026 10:36Current
5.9Medium risk
Vulners AI Score5.9
CVSS 25
EPSS0.36732
6