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AUSCERT External Security Bulletin Redistribution
MFSA 2020-22 Security Vulnerabilities fixed in Thunderbird 68.9.0
5 June 2020
AusCERT Security Bulletin Summary
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Denial of Service -- Remote with User Interaction
Access Confidential Data -- Remote with User Interaction
Reduced Security -- Remote with User Interaction
CVE Names: CVE-2020-12410 CVE-2020-12406 CVE-2020-12405
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Mozilla Foundation Security Advisory 2020-22
Security Vulnerabilities fixed in Thunderbird 68.9.0
June 2, 2020
# CVE-2020-12399: Timing attack on DSA signatures in NSS library
Cesar Pereida Garcia and the Network and Information Security Group (NISEC)
at Tampere University
NSS has shown timing differences when performing DSA signatures, which was
exploitable and could eventually leak private keys.
o Bug 1631576
# CVE-2020-12405: Use-after-free in SharedWorkerService
Marcin 'Icewall' Noga of Cisco Talos
When browsing a malicious page, a race condition in our SharedWorkerService
could occur and lead to a potentially exploitable crash.
o Bug 1631618
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.
o Bug 1639590
# CVE-2020-12410: Memory safety bugs fixed in Thunderbird 68.9.0
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.
o Memory safety bugs fixed in Thunderbird 68.9.0
# CVE-2020-12398: Security downgrade with IMAP STARTTLS leads to information
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.
o Bug 1613623
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