SB2021072293 - Ubuntu update for curl
Published: July 22, 2021
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 3 secuirty vulnerabilities.
1) Use of uninitialized variable (CVE-ID: CVE-2021-22898)
The vulnerability allows a remote attacker to gain access to sensitive information.
The vulnerability exists due to usage of uninitialized variable in code, responsible for processing TELNET requests when parsing NEW_ENV variables. A remote attacker can force the affected application to connect to a telnet server under attackers control and read up to 1800 bytes from the uninitialized memory on the libcurl client system.
Proof of concept:
curl telnet://example.com -tNEW_ENV=a,bbbbbb (256 'b's)2) Improper Certificate Validation (CVE-ID: CVE-2021-22924)
The vulnerability allows a remote attacker to compromise the target system.
The vulnerability exists due to errors in the logic when the config matching function does not take "issuer cert" into account and it compares the involved paths case insensitively. A remote attacker can gain access to sensitive information on the system.
3) Use of Uninitialized Variable (CVE-ID: CVE-2021-22925)
The vulnerability allows a remote attacker to gain access to sensitive information.
The vulnerability exists due to usage of uninitialized variable in code, responsible for processing TELNET requests when parsing NEW_ENV variables. A remote attacker can force the affected application to connect to a telnet server under attackers control and read up to 1800 bytes from the uninitialized memory on the libcurl client system.
Remediation
Install update from vendor's website.