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Debian LTS Advisory DLA-2685-1                [email protected]
https://www.debian.org/lts/security/                          Abhijith PA
June 14, 2021                                 https://wiki.debian.org/LTS
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Package        : squid3
Version        : 3.5.23-5+deb9u7
CVE ID         : CVE-2021-28651 CVE-2021-28652 CVE-2021-31806 CVE-2021-31807 
                 CVE-2021-31808 CVE-2021-33620

Several vulnerabilities were discovered in Squid, a proxy caching 
server. 

CVE-2021-28651

    Due to a buffer-management bug, it allows a denial of service. 
    When resolving a request with the urn: scheme, the parser leaks a 
    small amount of memory. However, there is an unspecified attack 
    methodology that can easily trigger a large amount of memory 
    consumption.

CVE-2021-28652

    Due to incorrect parser validation, it allows a Denial of Service 
    attack against the Cache Manager API. This allows a trusted client 
    to trigger memory leaks that. over time, lead to a Denial of 
    Service via an unspecified short query string. This attack is 
    limited to clients with Cache Manager API access privilege.

CVE-2021-31806

    Due to a memory-management bug, it is vulnerable to a Denial of 
    Service attack (against all clients using the proxy) via HTTP 
    Range request processing.

CVE-2021-31807

    An integer overflow problem allows a remote server to achieve 
    Denial of Service when delivering responses to HTTP Range 
    requests. The issue trigger is a header that can be expected to 
    exist in HTTP traffic without any malicious intent.

CVE-2021-31808

    Due to an input-validation bug, it is vulnerable to a Denial of 
    Service attack (against all clients using the proxy). A client 
    sends an HTTP Range request to trigger this.

CVE-2021-33620

    Remote servers to cause a denial of service (affecting 
    availability to all clients) via an HTTP response. The issue 
    trigger is a header that can be expected to exist in HTTP traffic 
    without any malicious intent by the server.

For Debian 9 stretch, these problems have been fixed in version
3.5.23-5+deb9u7.

We recommend that you upgrade your squid3 packages.

For the detailed security status of squid3 please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/squid3

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS