Security restrictions bypass in Linux kernel - CVE-2017-7895

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Main Vulnerability Database Vulnerabilities #VU7238

Security restrictions bypass in Linux kernel - CVE-2017-7895

Published: June 29, 2017 / Updated: June 30, 2017


Vulnerability identifier: #VU7238
CSH Severity: Low
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2017-7895
CWE-ID: CWE-119
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to bypass security restrictions on the target system.

The weakness exists due to boundary error when handling a user-supplied input. A remote attacker can send a specially crafted request, trigger pointer-arithmetic errors or possibly have unspecified other impact related to fs/nfsd/nfs3xdr.c and fs/nfsd/nfsxdr.c.

Successful exploitation of the vulnerability results in access to the system.

Affected software

Linux kernel
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux Server - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for Power, big endian - Extended Update Support
Red Hat Enterprise Linux EUS Compute Node
Red Hat Enterprise Linux Server for ARM
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux Server - TUS
Fedora

MRG Realtime
kernel (Red Hat package)
kernel-rt (Red Hat package)
kernel

How to mitigate CVE-2017-7895

Install update from vendor's website.

kernel (Red Hat package) - addressed in versions 2.6.18-348.34.1.el5, 2.6.32-220.75.1.el6, 2.6.32-431.82.1.el6, 2.6.32-573.45.1.el6, 3.10.0-514.26.1.el7
kernel-rt (Red Hat package) - addressed in versions 3.10.0-514.rt56.228.el6rt, 3.10.0-514.26.1.rt56.442.el7
kernel - addressed in versions 4.10.14-100.fc24, 4.10.14-200.fc25

External References

Related Security Bulletins