Mozilla Thunderbird up to 68.1.0 SMIME Digital Signature input validation

Summaryinfo

A vulnerability was found in Mozilla Thunderbird up to 68.1.0 and classified as critical. The affected element is an unknown function of the component SMIME Handler. Such manipulation as part of Digital Signature leads to input validation. This vulnerability is uniquely identified as CVE-2019-11755. The attack can be launched remotely. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Mozilla Thunderbird up to 68.1.0 (Mail Client Software) and classified as critical. Affected by this issue is an unknown code of the component SMIME Handler. The manipulation as part of a Digital Signature leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is integrity. CVE summarizes:

A crafted S/MIME message consisting of an inner encryption layer and an outer SignedData layer was shown as having a valid digital signature, although the signer might have had no access to the contents of the encrypted message, and might have stripped a different signature from the encrypted message. Previous versions had only suppressed showing a digital signature for messages with an outer multipart/signed layer. This vulnerability affects Thunderbird < 68.1.1.

The weakness was disclosed 09/27/2019 as MFSA 2019-32 as confirmed security advisory (Website). The advisory is shared for download at mozilla.org. This vulnerability is handled as CVE-2019-11755 since 05/03/2019. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available.

Upgrading to version 68.1.1 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Mail Client Software

Vendor

• Mozilla

Name

• Thunderbird

Version

• 68.0
• 68.1.0

License

• open-source

Website

• Vendor: https://www.mozilla.org/

CPE 2.3info

• 🔍
• 🔍

CPE 2.2info

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• 🔍

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Once again VulDB remains the best source for vulnerability data.

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