Linux Security
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    Debian LTS: DLA-2394-1: squid3 security update

    Date 02 Oct 2020
    Posted By LinuxSecurity Advisories
    Several security vulnerabilities have been discovered in Squid, a high- performance proxy caching server for web clients. CVE-2020-15049
    - -------------------------------------------------------------------------
    Debian LTS Advisory DLA-2394-1               This email address is being protected from spambots. You need JavaScript enabled to view it.                     Markus Koschany
    October 02, 2020                   
    - -------------------------------------------------------------------------
    Package        : squid3
    Version        : 3.5.23-5+deb9u5
    CVE ID         : CVE-2020-15049 CVE-2020-15810 CVE-2020-15811
    Several security vulnerabilities have been discovered in Squid, a high-
    performance proxy caching server for web clients.
        An issue was discovered in http/ in
        Squid. A Request Smuggling and Poisoning attack can succeed against
        the HTTP cache. The client sends an HTTP request with a Content-
        Length header containing "+\ "-" or an uncommon shell whitespace
        character prefix to the length field-value.
        This update also includes several other improvements to the
        HttpHeader parsing code.
    CVE-2020-15810 and CVE-2020-15811
        Due to incorrect data validation, HTTP Request Smuggling attacks may
        succeed against HTTP and HTTPS traffic. This leads to cache
        poisoning and allows any client, including browser scripts, to
        bypass local security and poison the proxy cache and any downstream
        caches with content from an arbitrary source. When configured for
        relaxed header parsing (the default), Squid relays headers
        containing whitespace characters to upstream servers. When this
        occurs as a prefix to a Content-Length header, the frame length
        specified will be ignored by Squid (allowing for a conflicting
        length to be used from another Content-Length header) but relayed
        Squid allows a trusted peer to perform Denial of Service by
        consuming all available CPU cycles during handling of a crafted
        Cache Digest response message. This only occurs when cache_peer is
        used with the cache digests feature. The problem exists because
        peerDigestHandleReply() livelocking in mishandles
    For Debian 9 stretch, these problems have been fixed in version
    We recommend that you upgrade your squid3 packages.
    For the detailed security status of squid3 please refer to
    its security tracker page at:
    Further information about Debian LTS security advisories, how to apply
    these updates to your system and frequently asked questions can be
    found at:

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