SB2020011102 - Multiple vulnerabilities in Mozilla Thunderbird

Description

This security bulletin contains information about 7 secuirty vulnerabilities.

1) Cross-site scripting (CVE-ID: CVE-2019-17022)

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data within the CSS sanitizer. When pasting a tag from the clipboard into a rich text editor, the CSS sanitizer does not escape < and > characters. If a webpage subsequently copies the node's innerHTML, assigning it to another innerHTML, this would result in an XSS vulnerability.

2) Buffer overflow (CVE-ID: CVE-2019-17024)

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) Race condition (CVE-ID: CVE-2019-17021)

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to a race condition that occurs during the initialization of a new content process. A remote attacker can exploit the race to gain access to potentially sensitive information, such as heap addresses from the parent process.

Note, this vulnerability affects Windows users only.

4) Type Confusion (CVE-ID: CVE-2019-17017)

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

The vulnerability exists due to a type confusion error when processing HTML content in XPCVariant.cpp. A remote attacker can create a specially crated web page, trigger a type confusion error and execute arbitrary code on the target system.

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

5) Buffer overflow (CVE-ID: CVE-2019-17015)

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

The vulnerability exists due to a boundary error during the initialization of a new content process. A remote attacker can create a specially crafted web site, 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.

Note, the vulnerability affects Windows users only.

6) Code Injection (CVE-ID: CVE-2019-17016)

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to improper input validation when pasting a tag from the clipboard into a rich text editor, the CSS sanitizer incorrectly rewrites a @namespace rule. This could allow for injection into certain types of websites resulting in data exfiltration.

7) Type Confusion (CVE-ID: CVE-2019-17026)

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

The vulnerability exists due to a type confusion error with StoreElementHole and FallibleStoreElement when processing HTML content in IonMonkey JIT compiler. A remote attacker can create a specially crafted webpage, trick the victim into visiting it, trigger a type confusion error and execute arbitrary code on the target system.

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

Note, this vulnerability is being actively exploited in the wild.

Remediation

Install update from vendor's website.

References

• https://www.mozilla.org/en-US/security/advisories/mfsa2020-04/