USN-77-1: Squid vulnerabilities
Posted on: 02/07/2005 03:27 PM

A Squid security update has been released for Ubuntu Linux 4.10

Ubuntu Security Notice USN-77-1 February 07, 2005
squid vulnerabilities
CAN-2005-0173, CAN-2005-0174, CAN-2005-0175, CAN-2005-0211

A security issue affects the following Ubuntu releases:

Ubuntu 4.10 (Warty Warthog)

The following packages are affected:


The problem can be corrected by upgrading the affected package to version 2.5.5-6ubuntu0.4. In general, a standard system upgrade is sufficient to effect the necessary changes.

Details follow:

A possible authentication bypass was discovered in the LDAP authentication backend. LDAP ignores leading and trailing whitespace in search filters. This could possibly be abused to bypass explicit access controls or confuse accounting when using several variants of the login name. (CAN-2005-0173)

Previous Squid versions were not strict enough while parsing HTTP requests and responses. Various violations of the HTTP protocol, such as multiple Content-Length header lines, invalid "Carriage Return" characters, and HTTP header names containing whitespace, led to cache pollution and could possibly be exploited to deliver wrong content to clients. (CAN-2005-0174)

Squid was susceptible to a cache poisoning attack called "HTTP response splitting", where false replies are injected in the HTTP stream. This allowed malicious web servers to forge wrong cache content for arbitrary web sites, which was then delivered to Squid clients. (CAN-2005-0175)

The FSC Vulnerability Research Team discovered a buffer overflow in the WCCP handling protocol. By sending an overly large WCCP packet, a remote attacker could crash the Squid server, and possibly even execute arbitrary code with the privileges of the "proxy" user. (CAN-2005-0211)

Source archives:
Size/MD5: 271207 8d50a79d90b0b3d22685035c46995da8
Size/MD5: 652 b4a0773e7b0038524e8622fdab752aea
Size/MD5: 1363967 6c7f3175b5fa04ab5ee68ce752e7b500

Architecture independent packages:
Size/MD5: 190348 bd299d23e0891d92026c970b217f30c0

amd64 architecture (Athlon64, Opteron, EM64T Xeon)
Size/MD5: 89774 e4fb7d8c7f232598ae6d095f51eebc9b
Size/MD5: 812968 af0a2933db8f46a5129c6809b8ead130
Size/MD5: 71130 842ccd1c4a7c43f9bc25796ccae95300

i386 architecture (x86 compatible Intel/AMD)
Size/MD5: 88300 49968f9c793659ba75b130686bb8f5cf
Size/MD5: 728568 cdeab80c247ece7055bf4509026ea52b
Size/MD5: 69876 ad4a1635432c3432d83b170823bd567d

powerpc architecture (Apple Macintosh G3/G4/G5)
Size/MD5: 89240 9034d9683ddba32e4e8667401bc0854c
Size/MD5: 796174 32314e33b9b2655065220692a63ab169
Size/MD5: 70624 cc8404f6a9b91018ce8b5b0e09f0416e

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