SB2018042302 - Gentoo update for mbed TLS
Published: April 23, 2018
Security Bulletin ID
SB2018042302
Severity
High
Patch available
YES
Number of vulnerabilities
3
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 3 secuirty vulnerabilities.
1) Security restrictions bypass (CVE-ID: CVE-2017-18187)
The vulnerability allows a remote attacker to bypass security restrictions on the target system.The weakness exists due to integer overflow in PSK identity parsing in the ssl_parse_client_psk_identity() function in library/ssl_srv.c. A remote attacker can trigger memory corruption and bypass bounds-check.
2) Buffer overflow (CVE-ID: CVE-2018-0487)
The vulnerability allows a remote unauthenticated attacker to execute arbitrary code on the target system.The weakness exists due to improper validation of Rivest-Shamir-Adleman Probabilistic Signature Scheme (RSASSA-PSS) signatures. A remote attacker can send a specially crafted certificate chain, which the affected software can mishandle during RSASSA-PSS signature verification, trigger buffer overflow and execute arbitrary code.
Successful exploitation of the vulnerability may result in system compromise.
3) Remote code execution (CVE-ID: CVE-2018-0488)
The vulnerability allows a remote unauthenticated attacker to execute arbitrary code on the target system.The weakness exists due to improper processing of crafted packets when using the truncated HMAC extension and CBC. A remote attacker can send a specially crafted input and execute arbitrary code.
Successful exploitation of the vulnerability may result in system compromise.
Remediation
Install update from vendor's website.