Headline
CVE-2020-12398: Security Vulnerabilities fixed in Thunderbird 68.9.0
If Thunderbird is configured to use STARTTLS for an IMAP server, and the server sends a PREAUTH response, then Thunderbird will continue with an unencrypted connection, causing email data to be sent without protection. This vulnerability affects Thunderbird < 68.9.0.
Mozilla Foundation Security Advisory 2020-22
Announced
June 2, 2020
Impact
high
Products
Thunderbird
Fixed in
- Thunderbird 68.9
In general, these flaws cannot be exploited through email in the Thunderbird product because scripting is disabled when reading mail, but are potentially risks in browser or browser-like contexts.
#CVE-2020-12399: Timing attack on DSA signatures in NSS library
Reporter
Cesar Pereida Garcia and the Network and Information Security Group (NISEC) at Tampere University
Impact
high
Description
NSS has shown timing differences when performing DSA signatures, which was exploitable and could eventually leak private keys.
References
- Bug 1631576
#CVE-2020-12405: Use-after-free in SharedWorkerService
Reporter
Marcin ‘Icewall’ Noga of Cisco Talos
Impact
high
Description
When browsing a malicious page, a race condition in our SharedWorkerService could occur and lead to a potentially exploitable crash.
References
- Bug 1631618
#CVE-2020-12406: JavaScript Type confusion with NativeTypes
Reporter
Iain Ireland
Impact
high
Description
Mozilla developer Iain Ireland discovered a missing type check during unboxed objects removal, resulting in a crash. We presume that with enough effort that it could be exploited to run arbitrary code.
References
- Bug 1639590
#CVE-2020-12410: Memory safety bugs fixed in Thunderbird 68.9.0
Reporter
Mozilla developers
Impact
high
Description
Mozilla developers Tom Tung and Karl Tomlinson reported memory safety bugs present in Firefox 68.8. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code.
References
- Memory safety bugs fixed in Thunderbird 68.9.0
#CVE-2020-12398: Security downgrade with IMAP STARTTLS leads to information leakage
Reporter
Damian Poddebniak
Impact
high
Description
If Thunderbird is configured to use STARTTLS for an IMAP server, and the server sends a PREAUTH response, then Thunderbird will continue with an unencrypted connection, causing email data to be sent without protection.
References
- Bug 1613623