SB2020042363 - Gentoo update for OpenSSL

Description

This security bulletin contains information about 3 secuirty vulnerabilities.

1) Cryptographic issues (CVE-ID: CVE-2019-1551)

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to an overflow issue within the rsaz_512_sqr(): the x64_64 Montgomery squaring procedure used in exponentiation with 512-bit moduli. A remote attacker can perform an attack against DH512 keys.

2) Information disclosure (CVE-ID: CVE-2019-15515)

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to software sends CSRF token in the query string. A remote attacker can gain access to the token via HTTP Referer header, bypass implemented CSRF protection mechanisms and perform CSRF attack

3) NULL pointer dereference (CVE-ID: CVE-2020-1967)

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 SSL_check_chain() function during or after a TLS 1.3 handshake. A remote attacker can send an invalid or unrecognised signature algorithm and perform a denial of service (DoS) attack.

Remediation

Install update from vendor's website.

References

• https://security.gentoo.org/
• https://security.gentoo.org/glsa/202004-10