#VU18800 Type Confusion in Mozilla Thunderbird - CVE-2019-11706

Vulnerability identifier: #VU18800

Vulnerability risk: Low

CVSSv4.0: 1.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/U:Clear]

CVE-ID: CVE-2019-11706

CWE-ID: CWE-843

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
Mozilla Thunderbird
Client/Desktop applications / Messaging software

Vendor: Mozilla

Description

The vulnerability allows a remote attacker to perform denial of service (DoS) attack.

The vulnerability exists due to a type confusion error within the iCal implementation in icaltimezone_get_vtimezone_properties function in icalproperty.c. A remote attacker can create a specially crafted email with malformed timezone data, trigger a type confusion error and crash the application.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Mozilla Thunderbird: 60.0 - 60.7.0

---

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

---

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.