[SECURITY] [DLA 2028-1] squid3 security update
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Package : squid3
Version : 3.4.8-6+deb8u9
CVE ID : CVE-2019-12526 CVE-2019-18677 CVE-2019-18678
It was found that Squid, a high-performance proxy caching server for
web clients, has been affected by the following security
URN response handling in Squid suffers from a heap-based buffer
overflow. When receiving data from a remote server in response to
an URN request, Squid fails to ensure that the response can fit
within the buffer. This leads to attacker controlled data
overflowing in the heap.
When the append_domain setting is used (because the appended
characters do not properly interact with hostname length
restrictions), it can inappropriately redirect traffic to origins
it should not be delivered to. This happens because of incorrect
A programming error allows attackers to smuggle HTTP requests
through frontend software to a Squid instance that splits the HTTP
Request pipeline differently. The resulting Response messages
corrupt caches (between a client and Squid) with
attacker-controlled content at arbitrary URLs. Effects are isolated
to software between the attacker client and Squid.
There are no effects on Squid itself, nor on any upstream servers.
The issue is related to a request header containing whitespace
between a header name and a colon.
Due to incorrect data management, Squid is vulnerable to
information disclosure when processing HTTP Digest Authentication.
Nonce tokens contain the raw byte value of a pointer that sits
within heap memory allocation. This information reduces ASLR
protections and may aid attackers isolating memory areas to target
for remote code execution attacks.
For Debian 8 "Jessie", these problems have been fixed in version
We recommend that you upgrade your squid3 packages.
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
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