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Vulnerability of pngcheck: buffer overflow via check_chunk_name

Synthesis of the vulnerability 

An attacker can trigger a buffer overflow via check_chunk_name() of pngcheck, in order to trigger a denial of service, and possibly to run code.
Vulnerable products: Fedora, openSUSE Leap, SLES.
Severity of this weakness: 2/4.
Creation date: 23/11/2020.
Références of this bulletin: CVE-2020-27818, FEDORA-2020-23432b7b72, FEDORA-2020-27b168926a, FEDORA-2020-4349e95c4f, openSUSE-SU-2020:2177-1, openSUSE-SU-2020:2198-1, openSUSE-SU-2020:2220-1, openSUSE-SU-2020:2227-1, VIGILANCE-VUL-33954.

Description of the vulnerability 

An attacker can trigger a buffer overflow via check_chunk_name() of pngcheck, in order to trigger a denial of service, and possibly to run code.
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This security threat impacts software or systems such as Fedora, openSUSE Leap, SLES.

Our Vigil@nce team determined that the severity of this computer weakness note 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 threat alert.

Solutions for this threat 

Fedora 31-33: new pngcheck packages.
New packages are available:
  Fedora 31: pngcheck 2.3.0-4.fc31
  Fedora 32: pngcheck 2.3.0-4.fc32
  Fedora 33: pngcheck 2.3.0-4.fc33

openSUSE Leap 15.1: new pngcheck packages.
New packages are available:
  openSUSE Leap 15.1: pngcheck 2.3.0-lp151.3.3.1

openSUSE Leap 15.2: new pngcheck packages.
New packages are available:
  openSUSE Leap 15.2: pngcheck 2.3.0-lp152.4.3.1

SUSE LE 15 SP1: new pngcheck packages.
New packages are available:
  SUSE LE 15 SP1: pngcheck 2.3.0-bp151.4.3.1

SUSE LE 15 SP2: new pngcheck packages.
New packages are available:
  SUSE LE 15 SP2: pngcheck 2.3.0-bp152.4.3.1
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