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Vulnerability of libytnef: nine vulnerabilities

Synthesis of the vulnerability 

An attacker can use several vulnerabilities of libytnef.
Vulnerable software: Debian, Ubuntu.
Severity of this announce: 2/4.
Number of vulnerabilities in this bulletin: 9.
Creation date: 29/03/2017.
Références of this computer vulnerability: CVE-2017-6298, CVE-2017-6299, CVE-2017-6300, CVE-2017-6301, CVE-2017-6302, CVE-2017-6303, CVE-2017-6304, CVE-2017-6305, CVE-2017-6306, DLA-878-1, DSA-3846-1, USN-3288-1, USN-4615-1, VIGILANCE-VUL-22273.

Description of the vulnerability 

Several vulnerabilities were announced in libytnef.

An attacker can force a NULL pointer to be dereferenced, in order to trigger a denial of service. [severity:1/4; CVE-2017-6298]

An attacker can generate an infinite loop via TNEFFillMapi(), in order to trigger a denial of service. [severity:2/4; CVE-2017-6299]

An attacker can generate a buffer overflow via lib/tnef-types.h, in order to trigger a denial of service, and possibly to run code. [severity:2/4; CVE-2017-6300]

An attacker can force a read at an invalid address, in order to trigger a denial of service, or to obtain sensitive information. [severity:2/4; CVE-2017-6301]

An attacker can generate an integer overflow, in order to trigger a denial of service, and possibly to run code. [severity:2/4; CVE-2017-6302]

An attacker can generate a memory corruption, in order to trigger a denial of service, and possibly to run code. [severity:2/4; CVE-2017-6303]

An attacker can force a read at an invalid address, in order to trigger a denial of service, or to obtain sensitive information. [severity:2/4; CVE-2017-6304]

An attacker can generate a memory corruption, in order to trigger a denial of service, and possibly to run code. [severity:2/4; CVE-2017-6305]

An attacker can traverse directories via SanitizeFilename(), in order to read a file outside the root path. [severity:2/4; CVE-2017-6306]
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This threat note impacts software or systems such as Debian, Ubuntu.

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

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

This bulletin is about 9 vulnerabilities.

An attacker with a expert ability can exploit this vulnerability note.

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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