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Squid 5.2 is available

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  • Squid 5.2 is available
    The Squid HTTP Proxy team is very pleased to announce the
    availability of the Squid-5.2 release!
    This release is a security release resolving several
    vulnerabilities and bugs found in the prior Squid releases.
    The major changes to be aware of:
     * SQUID-2020:12 Out-Of-Bounds memory access in WCCPv2
       (CVE-2021-28116 aka ZDI-CAN-11610)
     Due to an out of bounds memory access Squid is vulnerable to an
     information leak vulnerability when processing WCCPv2 messages.
     This problem allows a WCCPv2 sender to corrupt Squids list of
     known WCCP routers and divert client traffic to attacker
     controlled routers.
     This attack is limited to Squid proxy with WCCPv2 enabled and
     IP spoofing of a router IP address configured as trusted in
     * SQUID-2021:6 Improper Certificate Validation of TLS server
     When validating an origin server or peer certificate, Squid may
     incorrectly classify certain certificates as trusted.
     This problem allows a remote server to obtain security trust
     when the trust is not valid. This indication of trust may be
     passed along to clients allowing access to unsafe or hijacked
     This problem is guaranteed to occur when multiple CA have
     signed the TLS server certificate. It may also occur in cases
     of broken server certificate chains.
     * Bug 4922: Improve ftp://... filename extraction
     Since 3.5 Squid has incorrectly truncated FTP downloads when
     the transfer is made in ASCII mode (with ';type=' argument).
     This release can be expected to work when downloading from all
     FTP servers.
     * Bug 5164: a copy-paste typo in HttpHdrCc::hasMinFresh()
     This bug shows up as incorrect HIT and MISS results when
     caching responses from a server using Cache-Control:min-fresh.
      All users of Squid are encouraged to upgrade as soon as
    See the ChangeLog for the full list of changes in this and
    earlier releases.
    Please refer to the release notes at
    when you are ready to make the switch to Squid-5
    This new release can be downloaded from our HTTP or FTP servers
    or the mirrors. For a list of mirror sites see
    If you encounter any issues with this release please file a bug
    Amos Jeffries
  • Squid 5 Proxy Server Stable Release -

    After three years of development , a stable release of the Squid 5.1 proxy server is presented , ready for use on production systems (the 5.0.x releases were beta). After making the 5.x branch stable, from now on, only fixes for vulnerabilities and stability problems will be made in it, and minor optimizations are also allowed. Development of new features will be done in the new experimental branch 6.0. Users of the previous stable 4.x branch are encouraged to plan a migration to the 5.x branch.

  • Squid Proxy Server 5.2 Bugfix Release Now Available

    Squid is one of the most popular proxy/cache server, and the 5.2 version fixes several vulnerabilities and bugs found in the prior Squid releases.

    Squid is a widely-used caching proxy server for Linux and Unix platforms. This means that it stores requested Internet objects, such as data on a Web or FTP server, on a machine that is closer to the requesting workstation than the server.

    In other words, it redirects object requests from clients (in this case, from Web browsers) to the server.

    Proxies provide added layers of security and cache services that make loading processes faster. Squid supports several caching protocols, such as hypertext caching protocols (HTCP), internet cache protocol (ICP), cache array routing protocol (CARP), and web cache communication protocol (WCCP). It also processes caching requests from Domain Name Server (DNS) lookups and Secure Sockets Layer (SSL).

    Now that a new version has been announced, let’s see what has changed in Squid 5.2.

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