A squid3 security update has been released for Debian GNU/Linux 9 LTS to address several vulnerabilities.
DLA 2685-1: squid3 security update
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Debian LTS Advisory DLA-2685-1 debian-lts@lists.debian.org
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
