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Vulnerability of Squid cache: information disclosure via HTTP Request Splitting

Synthesis of the vulnerability 

An attacker can bypass access restrictions to data via HTTP Request Splitting of Squid cache, in order to obtain sensitive information.
Impacted systems: Debian, Fedora, openSUSE Leap, RHEL, Squid, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this alert: 2/4.
Creation date: 24/08/2020.
Références of this alert: CVE-2020-15811, DLA-2394-1, DSA-4751-1, FEDORA-2020-63f3bd656e, FEDORA-2020-73af8655eb, openSUSE-SU-2020:1346-1, openSUSE-SU-2020:1369-1, RHSA-2020:3623-01, RHSA-2020:4082-01, SQUID-2020:8, SUSE-SU-2020:14590-1, SUSE-SU-2020:2442-1, SUSE-SU-2020:2443-1, SUSE-SU-2020:2471-1, USN-4477-1, USN-4551-1, VIGILANCE-VUL-33137.

Description of the vulnerability 

An attacker can bypass access restrictions to data via HTTP Request Splitting of Squid cache, in order to obtain sensitive information.
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This computer threat announce impacts software or systems such as Debian, Fedora, openSUSE Leap, RHEL, Squid, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

Our Vigil@nce team determined that the severity of this computer vulnerability is medium.

The trust level is of type confirmed by the editor, with an origin of intranet client.

An attacker with a expert ability can exploit this cybersecurity alert.

Solutions for this threat 

Squid cache: version 4.13.
The version 4.13 is fixed:
  http://www.squid-cache.org/Versions/v4/
  ftp://ftp.squid-cache.org/pub/squid/
  ftp://ftp.squid-cache.org/pub/archive/4/

Debian 10: new squid packages.
New packages are available:
  Debian 10: squid 4.6-1+deb10u4

Debian 9: new squid3 packages.
New packages are available:
  Debian 9: squid3 3.5.23-5+deb9u5

Fedora 31-32: new squid packages.
New packages are available:
  Fedora 31: squid 4.13-1.fc31
  Fedora 32: squid 4.13-1.fc32

openSUSE Leap 15.1: new squid packages.
New packages are available:
  openSUSE Leap 15.1: squid 4.13-lp151.2.24.1

openSUSE Leap 15.2: new squid packages.
New packages are available:
  openSUSE Leap 15.2: squid 4.13-lp152.2.6.1

RHEL 7.9: new squid packages.
New packages are available:
  RHEL 7.9: squid 3.5.20-17.el7_9.4

RHEL 8.0-8.1: new squid-4 module.
The following module is updated:
  RHEL 8.0 Module: squid:4
  RHEL 8.1 Module: squid:4

SUSE LE 11 SP3-4: new squid3 packages.
New packages are available:
  SUSE LE 11 SP3: squid3 3.1.23-8.16.37.15.1
  SUSE LE 11 SP4: squid3 3.1.23-8.16.37.15.1

SUSE LE 12: new squid packages.
New packages are available:
  SUSE LE 12 SP2: squid 3.5.21-26.32.1
  SUSE LE 12 SP3: squid 3.5.21-26.32.1
  SUSE LE 12 SP4: squid 3.5.21-26.32.1

SUSE LE 12 SP5: new squid packages.
New packages are available:
  SUSE LE 12 SP5: squid 4.13-4.15.1

SUSE LE 15: new squid packages.
New packages are available:
  SUSE LE 15 RTM: squid 4.13-5.23.1
  SUSE LE 15 SP1: squid 4.13-5.23.1
  SUSE LE 15 SP2: squid 4.13-5.23.1

Ubuntu 20.04: new squid packages.
New packages are available:
  Ubuntu 20.04 LTS: squid 4.10-1ubuntu1.2

Ubuntu: new squid packages.
New packages are available:
  Ubuntu 18.04 LTS: squid 3.5.27-1ubuntu1.9
  Ubuntu 16.04 LTS: squid 3.5.12-1ubuntu7.15
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