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AUSCERT External Security Bulletin Redistribution
ESB-2020.3435
squid3 security update
5 October 2020
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: squid3
Publisher: Debian
Operating System: Debian GNU/Linux 9
Impact/Access: Denial of Service -- Remote/Unauthenticated
Provide Misleading Information -- Existing Account
Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-24606 CVE-2020-15811 CVE-2020-15810
CVE-2020-15049
Reference: ESB-2020.3406
ESB-2020.3333
ESB-2020.2953
Original Bulletin:
https://lists.debian.org/debian-lts-announce/2020/10/msg00005.html
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Debian LTS Advisory DLA-2394-1 debian-lts@lists.debian.org
https://www.debian.org/lts/security/ Markus Koschany
October 02, 2020 https://wiki.debian.org/LTS
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Package : squid3
Version : 3.5.23-5+deb9u5
CVE ID : CVE-2020-15049 CVE-2020-15810 CVE-2020-15811
CVE-2020-24606
Several security vulnerabilities have been discovered in Squid, a high-
performance proxy caching server for web clients.
CVE-2020-15049
An issue was discovered in http/ContentLengthInterpreter.cc 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
upstream.
CVE-2020-24606
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 peer_digest.cc mishandles
EOF.
For Debian 9 stretch, these problems have been fixed in version
3.5.23-5+deb9u5.
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
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You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
https://www.auscert.org.au/bulletins/
===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
===========================================================================
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The post ESB-2020.3435 – [Debian] squid3: Multiple vulnerabilities appeared first on Malware Devil.
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