SB2020020801 - Ubuntu update for ARM mbed TLS
Published: February 8, 2020
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 5 secuirty vulnerabilities.
1) Information disclosure (CVE-ID: CVE-2018-0498)
The vulnerability allows a remote attacker to obtain potentially sensitive information.
The vulnerability exists in ARM mbed TLS due to insufficient security restrictions imposed by the affected software when a cipher suite based on cipher block chaining (CBC) is used. A remote attacker who is able to observe and manipulate network packets can conduct a timing-based side-channel attack and partially recover the plaintext content.
2) Information disclosure (CVE-ID: CVE-2018-0497)
The vulnerability allows a remote attacker to obtain potentially sensitive information.
The vulnerability exists in ARM mbed TLS due to incomplete fix for CVE-2013-0169 and improper calculation of the secure hash algorithm-384 (SHA-384) when using a cipher suite based on cipher block chaining (CBC). A remote attacker who is able to observe and manipulate network packets can conduct a timing-based side-channel attack and partially recover the plaintext content.
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.
4) 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.
5) 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.
Remediation
Install update from vendor's website.