Mozilla Thunderbird up to 60.7.0 iCal parser_get_next_char Email Message memory corruption

Summaryinfo

A vulnerability labeled as critical has been found in Mozilla Thunderbird up to 60.7.0. Impacted is the function parser_get_next_char of the component iCal Handler. Executing a manipulation as part of Email Message can lead to memory corruption. The identification of this vulnerability is CVE-2019-11703. The attack may be launched remotely. Furthermore, there is an exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as critical was found in Mozilla Thunderbird up to 60.7.0 (Mail Client Software). This vulnerability affects the function parser_get_next_char of the component iCal Handler. The manipulation as part of a Email Message leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

A flaw in Thunderbird's implementation of iCal causes a heap buffer overflow in parser_get_next_char when processing certain email messages, resulting in a potentially exploitable crash. This vulnerability affects Thunderbird < 60.7.1.

The weakness was shared 07/23/2019 (Website). The advisory is shared for download at security.gentoo.org. This vulnerability was named CVE-2019-11703 since 05/03/2019. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. Technical details and also a public exploit are known.

It is possible to download the exploit at exploit-db.com. It is declared as proof-of-concept. As 0-day the estimated underground price was around $25k-$100k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 176982 (Debian Security Update for thunderbird (DSA 4464-1)).

Upgrading to version 60.7.1 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Exploit-DB (47003). The entries VDB-138485, VDB-138486 and VDB-138487 are related to this item. Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Mail Client Software

Vendor

• Mozilla

Name

• Thunderbird

Version

• 60.0
• 60.1
• 60.2
• 60.3
• 60.4
• 60.5
• 60.6
• 60.7.0

License

• open-source

Website

• Vendor: https://www.mozilla.org/

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Once again VulDB remains the best source for vulnerability data.

Discussion