CVE-2019-11745 : What You Need to Know

A security issue was identified in the encryption process using a block cipher, affecting Thunderbird, Firefox ESR, and Firefox.

Understanding CVE-2019-11745

This CVE involves an out-of-bounds write vulnerability in NSS when encrypting with a block cipher.

What is CVE-2019-11745?

When data smaller than the block size was input to the NSC_EncryptUpdate function, it could lead to an out-of-bounds write operation, potentially causing heap corruption and crashes.

The Impact of CVE-2019-11745

The vulnerability affects Thunderbird versions before 68.3, Firefox ESR versions before 68.3, and Firefox versions before 71.

Technical Details of CVE-2019-11745

This section provides more in-depth technical insights into the CVE.

Vulnerability Description

The issue arises from a small out-of-bounds write during encryption, leading to potential heap corruption and exploitable crashes.

Affected Systems and Versions

Thunderbird versions before 68.3
Firefox ESR versions before 68.3
Firefox versions before 71

Exploitation Mechanism

Inputting data smaller than the block size to NSC_EncryptUpdate
Possibility of out-of-bounds write operation

Mitigation and Prevention

Protecting systems from the CVE and implementing long-term security measures.

Immediate Steps to Take

Update Thunderbird, Firefox ESR, and Firefox to versions 68.3 and 71, respectively
Monitor for any unusual activities on the affected systems

Long-Term Security Practices

Regularly update software and apply security patches promptly
Conduct security audits and assessments to identify vulnerabilities

Patching and Updates

Apply the necessary patches provided by Mozilla to address the vulnerability