SB2017060234 - Multiple vulnerabilities in QEMU

Description

This security bulletin contains information about 2 vulnerabilities.

1) Denial of service (CVE-ID: CVE-2017-7539)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to cause DoS condition on a targeted system.

The weakness exists due to an assertion failure when handling malicious input. A remote attacker can submit a specially crafted data during initial connection negotiation and cause the qemu-nbd server to stop functioning.

Successful exploitation of the vulnerability results in denial of service.

2) Stack-based buffer overflow (CVE-ID: CVE-2017-15118)

CWE-ID: CWE-121 - Stack-based buffer overflow

CVSSv4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

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

The vulnerability exists in the network block device (NBD) server implementation due to stack-based buffer overflow when handling malicious input. A remote unauthenticated attacker can send a large export-name request, trigger memory corruption and cause the service to crash or execute arbitrary code with elevated privileges.

Remediation

Install update from vendor's website.

References

• https://git.qemu.org/?p=qemu.git;a=commit;h=ff82911cd3f69f028f2537825c9720ff78bc3f19
• https://git.qemu.org/?p=qemu.git&a=commit&h=f37708f6b8