SB2020070604 - Debian update for thunderbird
Published: July 6, 2020
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 5 secuirty vulnerabilities.
1) Input validation error (CVE-ID: CVE-2020-12417)
The vulnerability allows a remote attacker to perform cache poisoning attack.
The vulnerability exists due to an error when processing the %2F character in a manifest URL, which results in Firefox's AppCache behavior to become confused and allowe a manifest to be served from a subdirectory. This could cause the appcache to be used to service requests for the top level directory.
2) Out-of-bounds read (CVE-ID: CVE-2020-12418)
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to a boundary condition while processing individual parts of a URL object. A remote attacker can create a specially crafted web page, trick the victim into opening it, trigger out-of-bounds read error and read contents of memory on the system.
3) Use-after-free (CVE-ID: CVE-2020-12419)
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a use-after-free error when processing callbacks that occurred during window flushing in the parent process in nsGlobalWindowInner. A remote attacker can create a specially crafted web page, trick the victim into visiting it, trigger a use-after-free error and execute arbitrary code on the target system.
Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.
4) Use-after-free (CVE-ID: CVE-2020-12420)
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a use-after-free error when trying to connect to a STUN server. A remote attacker can create a specially crafted web page, trick the victim into visiting it, trigger a race condition that causes the use-after-free of a pointer and execute arbitrary code on the system.
Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.
5) Improper Certificate Validation (CVE-ID: CVE-2020-12421)
The vulnerability allows a remote attacker to disable installed Add-Ons.
The vulnerability exists due to Add-On updates do not respect the same certificate trust rules as software updates. When performing add-on updates, certificate chains terminating in non-built-in-roots were rejected (even if they were legitimately added by an administrator.) This could have caused add-ons to become out-of-date silently without notification to the user.
Remediation
Install update from vendor's website.