SB2020040332 - Use-after-free in firefox-esr (Alpine package)
Published: April 3, 2020
Security Bulletin ID
SB2020040332
Severity
Critical
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Use-after-free (CVE-ID: CVE-2020-6819)
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a use-after-free error caused by a race condition running the nsDocShell destructor. A remote attacker can create a specially crafted website, trick the victim into visiting it, trigger a use-after-free error and execute arbitrary code on the system.
Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.
Note, this vulnerability is being actively exploited in the wild in targeted attacks.
Remediation
Install update from vendor's website.
References
- https://git.alpinelinux.org/aports/commit/?id=174183ffc582462ae8eaf468da032a6642e140c4
- https://git.alpinelinux.org/aports/commit/?id=9e2f5a5133c02cac8537d753874de3c9ba0ad559
- https://git.alpinelinux.org/aports/commit/?id=643b492b9ed0d04d8f07f23e5271fbe9ea02d717
- https://git.alpinelinux.org/aports/commit/?id=0a453dd802559d8cf38ccc05d957a5a0988da323
- https://git.alpinelinux.org/aports/commit/?id=fdf87ca78a3e4585581cc08fa370a84c03d17cdc