SB2019103006 - Ubuntu update for Libidn2

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Main Vulnerability Database SB2019103006

SB2019103006 - Ubuntu update for Libidn2

Published: October 30, 2019

Security Bulletin ID SB2019103006
CSH Severity
High
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

High 50% Low 50%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 vulnerabilities.


1) Heap-based buffer overflow (CVE-ID: CVE-2019-18224)

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error within the idn2_to_ascii_4i() function in lib/lookup.c when processing domain names. A remote attacker can trick the victim to visit a specially crafted website, trigger heap-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.


2) Input validation error (CVE-ID: CVE-2019-12290)

The vulnerability allows a remote attacker to perform spoofing attack.

The vulnerability exists due to libidn2 fails to perform roundtrip checks specified in RFC3490 Section 4.2 when converting A-labels to U-labels. A remote attacker can use a specially crafted domain name to impersonate a trusted website.


Remediation

Install update from vendor's website.

References