QEMU hw/rdma/vmw/pvrdma_cmd.c create_cq_ring/create_qp_rings null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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6.4$0-$5k0.00

Summaryinfo

A vulnerability has been found in QEMU and classified as problematic. This affects the function create_cq_ring/create_qp_rings of the file hw/rdma/vmw/pvrdma_cmd.c. This manipulation causes null pointer dereference. This vulnerability is tracked as CVE-2018-20125. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in QEMU (Virtualization Software) (the affected version unknown). It has been declared as problematic. Affected by this vulnerability is the function create_cq_ring/create_qp_rings of the file hw/rdma/vmw/pvrdma_cmd.c. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. As an impact it is known to affect availability. The summary by CVE is:

hw/rdma/vmw/pvrdma_cmd.c in QEMU allows attackers to cause a denial of service (NULL pointer dereference or excessive memory allocation) in create_cq_ring or create_qp_rings.

The bug was discovered 12/19/2018. The weakness was disclosed 12/20/2018 by Li Qiang (oss-sec). The advisory is shared at openwall.com. This vulnerability is known as CVE-2018-20125 since 12/13/2018. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/26/2024).

The vulnerability was handled as a non-public zero-day exploit for at least 1 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 209571 (Oracle Linux 8 : virt:kvm_utils3 (ELSA-2024-12792)), which helps to determine the existence of the flaw in a target environment. The commercial vulnerability scanner Qualys is able to test this issue with plugin 157908 (Oracle Enterprise Linux Security Update for qemu (ELSA-2019-4518)).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (209571) and SecurityFocus (BID 106298†). The entries VDB-127948, VDB-128256, VDB-128258 and VDB-128259 are pretty similar. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.4

VulDB Base Score: 5.3
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 209571
Nessus Name: Oracle Linux 8 : virt:kvm_utils3 (ELSA-2024-12792)

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

12/13/2018 🔍
12/19/2018 +6 days 🔍
12/19/2018 +0 days 🔍
12/20/2018 +1 days 🔍
12/20/2018 +0 days 🔍
12/21/2018 +1 days 🔍
10/26/2024 +2136 days 🔍

Sourcesinfo

Product: qemu.org

Advisory: USN-3923-1
Researcher: Li Qiang
Status: Confirmed

CVE: CVE-2018-20125 (🔍)
GCVE (CVE): GCVE-0-2018-20125
GCVE (VulDB): GCVE-100-128257
SecurityFocus: 106298 - QEMU 'hw/rdma/vmw/pvrdma_cmd.c' Multiple Local Denial of Service Vulnerabilities

See also: 🔍

Entryinfo

Created: 12/21/2018 13:02
Updated: 10/26/2024 21:05
Changes: 12/21/2018 13:02 (61), 04/23/2020 09:14 (4), 06/20/2023 14:10 (3), 10/26/2024 21:05 (16)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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