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Ubuntu 20.10 USN-4737-1 Medium: Firefox Security Flaw Detected

ubuntu
Calendar Grey February 16, 2021
Dist Ubuntu Esm H88
Several vulnerabilities addressed in Thunderbird for Ubuntu 20.10, mitigating risks of denial of service and potential code execution exploits.
Several security issues were fixed in Thunderbird.

Summary

Several security issues were fixed in Thunderbird.

Software Description:

- thunderbird: Mozilla Open Source mail and newsgroup client

Details:

Multiple security issues were discovered in Thunderbird. If a user were

tricked into opening a specially crafted website in a browsing context,

an attacker could potentially exploit these to cause a denial of service,

obtain sensitive information, or execute arbitrary code. (CVE-2020-26976,

CVE-2021-23953, CVE-2021-23954, CVE-2021-23960, CVE-2021-23964)

It was discovered that responses received during the plaintext phase of

the STARTTLS connection setup were subsequently evaluated during the

encrypted session. A person in the middle could potentially exploit this

to perform a response injection attack. (CVE-2020-15685)

Topics%20covered

Topics Covered

security advisory moderate denial of service information disclosure ubuntu thunderbird

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 20.10:
  thunderbird                     1:78.7.1+build1-0ubuntu0.20.10.4

After a standard system update you need to restart Thunderbird to make
all the necessary changes.

References

https://ubuntu.com/security/notices/USN-4736-1

CVE-2020-15685, CVE-2020-26976, CVE-2021-23953, CVE-2021-23954,

CVE-2021-23960, CVE-2021-23964

Severity
medium
Lowest
Low
Medium
High
Critical

February 16, 2021

Topics%20covered

Topics Covered

security advisory moderate denial of service information disclosure ubuntu thunderbird

Package Information

https://launchpad.net/ubuntu/+source/thunderbird/1:78.7.1+build1-0ubuntu0.20.10.4

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