Linux Kernel up to 4.10.13 NFSv2/NFSv3 fs/nfsd/nfs3xdr.c numeric error

CVSS Meta Temp Score
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CTI Interest Score
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8.4$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 4.10.13. Impacted is an unknown function of the file fs/nfsd/nfs3xdr.c of the component NFSv2/NFSv3. This manipulation causes numeric error. This vulnerability appears as CVE-2017-7895. The attack may be initiated remotely. There is no available exploit. It is suggested to install a patch to address this issue.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 4.10.13 (Operating System) and classified as critical. Affected by this vulnerability is an unknown functionality of the file fs/nfsd/nfs3xdr.c of the component NFSv2/NFSv3. The manipulation with an unknown input leads to a numeric error vulnerability. The CWE definition for the vulnerability is CWE-189. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

The NFSv2 and NFSv3 server implementations in the Linux kernel through 4.10.13 lack certain checks for the end of a buffer, which allows remote attackers to trigger pointer-arithmetic errors or possibly have unspecified other impact via crafted requests, related to fs/nfsd/nfs3xdr.c and fs/nfsd/nfsxdr.c.

The bug was discovered 04/28/2017. The weakness was presented 04/28/2017 as confirmed git commit (GIT Repository). The advisory is shared at git.kernel.org. This vulnerability is known as CVE-2017-7895 since 04/18/2017. 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 vulnerability scanner Nessus provides a plugin with the ID 100078 (Fedora 24 : kernel (2017-ad045f80ac)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 196809 (Ubuntu Security Notification for Linux, Linux-raspi2 Vulnerabilities (USN-3314-1)).

Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. A possible mitigation has been published 2 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (100078) and SecurityFocus (BID 98085†). See VDB-100271, VDB-100469, VDB-100470 and VDB-101174 for similar entries. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.5
VulDB Meta Temp Score: 8.4

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Numeric error
CWE: CWE-189
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: 100078
Nessus Name: Fedora 24 : kernel (2017-ad045f80ac)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 867773
OpenVAS Name: Fedora Update for kernel FEDORA-2017-b9b1ac0d15
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Patch: git.kernel.org

Timelineinfo

04/18/2017 🔍
04/28/2017 +10 days 🔍
04/28/2017 +0 days 🔍
04/28/2017 +0 days 🔍
04/28/2017 +0 days 🔍
04/28/2017 +0 days 🔍
05/09/2017 +11 days 🔍
05/10/2017 +1 days 🔍
12/02/2022 +2032 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: FEDORA-2017-ad045f80ac
Researcher: Ari Kauppi
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-7895 (🔍)
GCVE (CVE): GCVE-0-2017-7895
GCVE (VulDB): GCVE-100-100633

OVAL: 🔍

SecurityFocus: 98085 - Linux Kernel CVE-2017-7895 Multiple Security Bypass Vulnerabilities
OSVDB: - CVE-2017-7895 - Linux - Security Bypass Issue

See also: 🔍

Entryinfo

Created: 04/28/2017 20:16
Updated: 12/02/2022 11:53
Changes: 04/28/2017 20:16 (80), 09/21/2020 16:26 (6), 12/21/2020 16:00 (2), 12/02/2022 11:45 (3), 12/02/2022 11:53 (1)
Complete: 🔍
Cache ID: 216::103

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

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