Thunderbird: Reduced Security -- Remote with User Interaction

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.4274
     MFSA 2020-53 Security Vulnerabilities fixed in Thunderbird 78.5.1
                              2 December 2020

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        AusCERT Security Bulletin Summary
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Product:           Thunderbird
Publisher:         Mozilla
Operating System:  Windows
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Reduced Security -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-26970  

Original Bulletin: 
   https://www.mozilla.org/en-US/security/advisories/mfsa2020-53/

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Mozilla Foundation Security Advisory 2020-53

Security Vulnerabilities fixed in Thunderbird 78.5.1

Announced
    December 1, 2020
Impact
    high
Products
    Thunderbird
Fixed in
       Thunderbird 78.5.1

# CVE-2020-26970: Stack overflow due to incorrect parsing of SMTP server
response codes

Reporter
    Chiaki Ishikawa
Impact
    high

Description

When reading SMTP server status codes, Thunderbird writes an integer value to a
position on the stack that is intended to contain just one byte. Depending on
processor architecture and stack layout, this leads to stack corruption that
may be exploitable.

References

  o Bug 1677338

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