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Vigil@nce - zlib: five vulnerabilities

February 2017 by Vigil@nce

This bulletin was written by Vigil@nce : https://vigilance.fr/offer

SYNTHESIS OF THE VULNERABILITY

An attacker can use several vulnerabilities of zlib.

Impacted products: openSUSE, openSUSE Leap, zlib.

Severity: 2/4.

Creation date: 05/12/2016.

DESCRIPTION OF THE VULNERABILITY

Several vulnerabilities were announced in zlib.

An attacker can generate a memory corruption via Deflate External
Linkage, in order to trigger a denial of service, and possibly to
run code. [severity:2/4]

A pointer error may have a consequence. [severity:1/4]

An attacker can force a read at an invalid address via inftrees.c,
in order to trigger a denial of service, or to obtain sensitive
information. [severity:1/4; CVE-2016-9840, CVE-2016-9841]

A negative number shift is undefined. [severity:1/4; CVE-2016-9842]

An attacker can force a read at an invalid address via Big-endian
Pointer, in order to trigger a denial of service, or to obtain
sensitive information. [severity:1/4; CVE-2016-9843]

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

https://vigilance.fr/vulnerability/zlib-five-vulnerabilities-21262


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