Denial of service in QEMU



| Updated: 2018-07-30
Risk Low
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2018-11806
CVE-2018-12617
CWE-ID CWE-122
CWE-190
Exploitation vector Network
Public exploit Public exploit code for vulnerability #2 is available.
Vulnerable software
 QEMU
Client/Desktop applications / Virtualization software

Vendor QEMU

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Heap-based buffer overflow

EUVDB-ID: #VU13375

Risk: Low

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-11806

CWE-ID: CWE-122 - Heap-based Buffer Overflow

Exploit availability: No

Description

The vulnerability allows a remote authenticated attacker to cause DoS condition on the target system.

The vulnerability exists due to heap-based buffer overflow when insufficient input and validation checking of Slirp networking back-end processes by the m_cat function, as defined in the slirp/mbuf.c source code file. A remote attacker can send malformed, fragmented packets, trigger memory corruption and cause the QEMU process to crash.

Mitigation

Install update from vendor's website.

Vulnerable software versions

QEMU: 0.1 - 2.11.1

CPE2.3 External links

https://git.qemu.org/?p=qemu.git;a=commit;h=864036e251f54c99d31df124aad7f34f01f5344c


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to open a a specially crafted file.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Integer overflow

EUVDB-ID: #VU14116

Risk: Low

CVSSv4.0: 7.7 [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/E:P/U:Clear]

CVE-ID: CVE-2018-12617

CWE-ID: CWE-190 - Integer overflow

Exploit availability: Yes

Description

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

The vulnerability exists due to integer overflow in qmp_guest_file_read in qga/commands-posix.c and qga/commands-win32.c in qemu-ga (aka QEMU Guest Agent). A remote attacker can send a specially crafted QMP command (including guest-file-read with a large count value) to the agent via the listening socket, cause a g_malloc0() call to trigger a segmentation fault when trying to allocate a large memory chunk and cause the service to crash.

Mitigation

Install update from vendor's website.

Vulnerable software versions

QEMU: 2.12.50

CPE2.3 External links

https://lists.gnu.org/archive/html/qemu-devel/2018-06/msg03385.html


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to open a a specially crafted file.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.



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