SB2021070720 - Ubuntu update for php7.2
Published: July 7, 2021
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 5 secuirty vulnerabilities.
1) Use-after-free (CVE-ID: CVE-2020-7068)
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to a use-after-free error in the "phar_parse_zipfile" function. A remote attacker can can cause a denial of service (DoS) condition on the target system.
2) Input validation error (CVE-ID: CVE-2020-7071)
The vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to insufficient validation of URL performed via the "FILTER_VALIDATE_URL" setting. A remote attacker can use the "@" characters in the URL to bypass implemented filter and force the application to accept arbitrary URL instead of the defined by the option.
Example:
http://evel.website@trusted.website
3) NULL pointer dereference (CVE-ID: CVE-2021-21702)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error within the SoapClient in PHP. A remote attacker can pass specially crafted data to the application and perform a denial of service (DoS) attack.
4) Stack-based buffer overflow (CVE-ID: CVE-2021-21704)
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
Multiple boundary errors exists within firebird_info_cb(), firebird_handle_doer(), firebird_stmt_execute(), and firebird_fetch_blob() function. A remote attacker can pass specially crafted input to the application, trigger a stack-based buffer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
5) Server-Side Request Forgery (SSRF) (CVE-ID: CVE-2021-21705)
The disclosed vulnerability allows a remote attacker to perform SSRF attacks.
The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can send a specially crafted HTTP request, bypass the FILTER_VALIDATE_URL and trick the application to initiate requests to arbitrary systems.
Successful exploitation of this vulnerability may allow a remote attacker gain access to sensitive data, located in the local network or send malicious requests to other servers from the vulnerable system.
Remediation
Install update from vendor's website.