SB2025082302 - Multiple vulnerabilities in Mozilla Thunderbird ESR

Description

This security bulletin contains information about 4 secuirty vulnerabilities.

1) Buffer overflow (CVE-ID: CVE-2025-9179)

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in GMP process when processing encrypted media. A remote attacker can trick the victim into visiting a specially crafted website, trigger memory corruption and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

2) Buffer overflow (CVE-ID: CVE-2025-9180)

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error when processing HTML content. A remote attacker can create a specially crafted website, trick the victim into opening it, trigger memory corruption and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

3) Use of Uninitialized Variable (CVE-ID: CVE-2025-9181)

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to use of uninitialized memory in the JavaScript engine. A remote attacker can trick the victim into visiting a specially crafted website, trigger memory corruption and execute arbitrary code on the system.

4) Security features bypass (CVE-ID: CVE-2025-9185)

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to an error in the Graphics: Canvas2D component. A remote attacker can bypass Same-origin policy restrictions.

Remediation

Install update from vendor's website.

References

• https://www.mozilla.org/en-US/security/advisories/mfsa2025-71/