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Vulnerability of libytnef: three vulnerabilities

Synthesis of the vulnerability 

An attacker can use several vulnerabilities of libytnef.
Vulnerable systems: Debian, Ubuntu.
Severity of this threat: 2/4.
Number of vulnerabilities in this bulletin: 3.
Creation date: 29/03/2017.
Références of this weakness: CVE-2017-6800, CVE-2017-6801, CVE-2017-6802, DLA-878-1, DSA-3846-1, USN-3288-1, USN-4615-1, VIGILANCE-VUL-22274.

Description of the vulnerability 

Several vulnerabilities were announced in libytnef.

An attacker can force a read at an invalid address via MAPIPrint(), in order to trigger a denial of service, or to obtain sensitive information. [severity:2/4; CVE-2017-6800]

An attacker can force a read at an invalid address via TNEFParse(), in order to trigger a denial of service, or to obtain sensitive information. [severity:2/4; CVE-2017-6801]

An attacker can force a read at an invalid address via DecompressRTF(), in order to trigger a denial of service, or to obtain sensitive information. [severity:2/4; CVE-2017-6802]
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This threat announce impacts software or systems such as Debian, Ubuntu.

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

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

This bulletin is about 3 vulnerabilities.

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

Solutions for this threat 

Debian 7: new libytnef packages.
New packages are available:
  Debian 7: libytnef 1.5-4+deb7u1

Debian 8: new libytnef packages.
New packages are available:
  Debian 8: libytnef 1.5-6+deb8u1

Ubuntu 14.04: new libytnef0 packages.
New packages are available:
  Ubuntu 14.04 LTS: libytnef0 1.5-6ubuntu0.1

Ubuntu 16.04: new libytnef0 packages.
New packages are available:
  Ubuntu 16.04 LTS: libytnef0 1.5-9ubuntu0.1
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