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Vulnerability of libgd2: information disclosure via gdImageCreateFromGifCtx

Synthesis of the vulnerability 

An attacker can bypass access restrictions to data via gdImageCreateFromGifCtx() of libgd2, in order to obtain sensitive information.
Vulnerable software: Debian, Fedora, openSUSE Leap, Solaris, RHEL, Slackware, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this announce: 2/4.
Creation date: 16/08/2017.
Références of this computer vulnerability: bulletinapr2018, CVE-2017-7890, DLA-1055-1, DSA-3938-1, FEDORA-2017-7cc0e6a5f5, FEDORA-2017-a69b0bb52d, openSUSE-SU-2017:2337-1, openSUSE-SU-2017:2366-1, RHSA-2018:0406-01, RHSA-2018:1296-01, SSA:2018-108-01, SUSE-SU-2017:2303-1, SUSE-SU-2020:0623-1, USN-3389-1, USN-3389-2, VIGILANCE-VUL-23521.

Description of the vulnerability 

An attacker can bypass access restrictions to data via gdImageCreateFromGifCtx() of libgd2, in order to obtain sensitive information.
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This computer threat note impacts software or systems such as Debian, Fedora, openSUSE Leap, Solaris, RHEL, Slackware, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

Our Vigil@nce team determined that the severity of this weakness alert is medium.

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

An attacker with a expert ability can exploit this computer weakness note.

Solutions for this threat 

Debian: new libgd2 packages.
New packages are available:
  Debian 7: libgd2 2.0.36~rc1~dfsg-6.1+deb7u9
  Debian 8: libgd2 2.1.0-5+deb8u10

Fedora 25: new gd packages.
New packages are available:
  Fedora 25: gd 2.2.5-1.fc25

Fedora 26: new gd packages.
New packages are available:
  Fedora 26: gd 2.2.5-1.fc26

openSUSE Leap: new php5 packages (06/09/2017).
New packages are available:
  openSUSE Leap 42.2: apache2-mod_php5 5.5.14-77.9.1, php5 5.5.14-77.9.1
  openSUSE Leap 42.3: apache2-mod_php5 5.5.14-82.1, php5 5.5.14-82.1

openSUSE Leap: new php7 packages.
New packages are available:
  openSUSE Leap 42.2: apache2-mod_php7 .0.7-14.9.1, php7 7.0.7-14.9.1
  openSUSE Leap 42.3: apache2-mod_php7 7.0.7-19.1, php7 7.0.7-19.1

Oracle Solaris: patch for third party software of April 2018 v1.
A patch is available:
  https://support.oracle.com/rs?type=doc&id=1448883.1

RHEL 7.4: new php packages.
New packages are available:
  RHEL 7: php 5.4.16-43.el7_4.1

RHEL: new rh-php70-php packages.
New packages are available:
  RHEL 6: rh-php70-php 7.0.27-1.el6
  RHEL 7: rh-php70-php 7.0.27-1.el7

Slackware: new gd packages.
New packages are available:
  Slackware 14.2: gd 2.2.5-*-1_slack14.2

SUSE LE 12: new gd packages.
New packages are available:
  SUSE LE 12 SP5: gd 2.1.0-24.17.1
  SUSE LE 12 SP4: gd 2.1.0-24.17.1
  SUSE LE 12 SP4: gd 2.1.0-24.17.1

SUSE LE 12: new php7 packages (31/08/2017).
New packages are available:
  SUSE LE 12 SP2: php7 7.0.7-50.9.2
  SUSE LE 12 SP3: php7 7.0.7-50.9.2

Ubuntu: new libgd-tools packages.
New packages are available:
  Ubuntu 17.04: libgd-tools 2.2.4-2ubuntu0.2
  Ubuntu 16.04 LTS: libgd-tools 2.1.1-4ubuntu0.16.04.7
  Ubuntu 14.04 LTS: libgd-tools 2.1.0-3ubuntu0.7
  Ubuntu 12.04 ESM: libgd-tools 2.0.36~rc1~dfsg-6ubuntu2.5
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