SB2019071914 - Fedora 30 update for libssh2

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Integer overflow (CVE-ID: CVE-2019-3855)

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to integer overflow in the _libssh2_transport_read() function in transport.cwhen processing packet_lengthvalues. A remote attacker can trick the victim to connect to a malicious SSH server, trigger integer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

2) Integer overflow (CVE-ID: CVE-2019-13115)

The vulnerability allows a remote attacker to execute arbitrary code or cause a denial of service (DoS) condition on a targeted system.

The vulnerability exists due to integer overflow in the "kex_method_diffie_hellman_group_exchange_sha256_key_exchange" function in the "kex.c" file. A remote attacker can trick a victim to connect to an attacker-controlled Secure Shell (SSH) server, which would allow the attacker to send packets that submit malicious input to the targeted system, trigger integer overflow leading to an out-of-bounds write condition and execute arbitrary code or cause a DoS condition.

Remediation

Install update from vendor's website.

References

• https://bodhi.fedoraproject.org/updates/FEDORA-2019-9d85600fc7