Main Vulnerability Database Vulnerabilities #VU18799

Stack-based buffer overflow in Mozilla Thunderbird - CVE-2019-11705

Published: June 14, 2019 / Updated: June 17, 2021

Vulnerability identifier: #VU18799

CSH Severity: High

CVSS v4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2019-11705

CWE-ID: CWE-121

Exploitation vector: Remote access

Exploit availability: Public exploit is available

Vulnerability details

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

The vulnerability exists due to a boundary error within iCal implementation in icalrecur_add_bydayrules function in icalrecur.c. A remote unauthenticated attacker can create a specially crafted email, trigger stack-based buffer overflow and execute arbitrary code on the target system.

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

Affected software

Mozilla Thunderbird
Arch Linux
Gentoo Linux
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for Power
Slackware Linux
Opensuse
SUSE Package Hub for SUSE Linux Enterprise
thunderbird (Ubuntu package)
thunderbird (Debian package)

How to mitigate CVE-2019-11705

Install updates from vendor's website.

Mozilla Thunderbird - update to 60.7.1
thunderbird (Ubuntu package) - addressed in versions 1:60.7.1+build1-0ubuntu0.16.04.1, 1:60.7.1+build1-0ubuntu0.18.04.1, 1:60.7.1+build1-0ubuntu0.18.10.1, 1:60.7.1+build1-0ubuntu0.19.04.1
thunderbird (Debian package) - update to 1:60.7.1-1~deb9u1

Links to Public Exploits and PoC-codes

Exploit #6126 - Thunderbird ESR < 60.7.XXX - 'icalrecur_add_bydayrules' Stack-Based Buffer Overflow (June 17, 2021)

External References

https://www.mozilla.org/en-US/security/advisories/mfsa2019-17/