Multiple serious vulnerabilities have been found in Mozilla Thunderbird. Malicious users can exploit these vulnerabilities to bypass security restrictions, cause denial of service, perform cross-site scripting and execute arbitrary code.

Below is a complete list of vulnerabilities:

1. A use-after-free vulnerability related to Fetch API can be exploited remotely to cause denial of service;
2. A use-after-free vulnerability related to Accessible Rich Internet Applications (ARIA) elements can be exploited remotely to cause denial of service;
3. A use-after-free vulnerability can be exploited to cause denial of service;
4. A buffer overflow vulnerability related to ANGLE graphics library can be exploited to cause denial of service;
5. A use-after-free vulnerability related to TLS 1.2 d can be exploited remotely to cause denial of service;
6. A vulnerability related to blob: and data: URLs can be exploited remotely to bypass security restrictions;
7. A vulnerability related to rendering of some OS X fonts can be exploited remotely to bypass security restrictions;
8. A vulnerability related to the content security policy (CSP) sandbox directive can be exploited remotely to perform cross-site scripting;
9. Multiple memory corruption vulnerabilities which occur because of memory safety bugs can be exploited remotely to execute arbitrary code.

Technical details

Vulnerability (2) only affects Firefox for Android. Other operating systems are not affected.

Vulnerability (3) occurs in design mode while resizing images.

Vulnerability (7) only affects OS X operating system. Other operating systems are not affected.

NB: Not every vulnerability already has CVSS rating, so cumulative CVSS rating can be not representative.

NB: At this moment VENDOR has just reserved CVE numbers for these vulnerabilities. Information can be changed soon.

Mozilla Thunderbird versions earlier than 52.4

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Mozilla Foundation Security Advisory 2017-23