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Vulnerability Details : CVE-2017-16995

The check_alu_op function in kernel/bpf/verifier.c in the Linux kernel through 4.14.8 allows local users to cause a denial of service (memory corruption) or possibly have unspecified other impact by leveraging incorrect sign extension.
Publish Date : 2017-12-27 Last Update Date : 2018-07-27
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- CVSS Scores & Vulnerability Types

CVSS Score
7.2
Confidentiality Impact Complete (There is total information disclosure, resulting in all system files being revealed.)
Integrity Impact Complete (There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the entire system being compromised.)
Availability Impact Complete (There is a total shutdown of the affected resource. The attacker can render the resource completely unavailable.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) Denial Of ServiceOverflowMemory corruption
CWE ID 119

- Products Affected By CVE-2017-16995

# Product Type Vendor Product Version Update Edition Language
1 OS Debian Debian Linux 9.0 Version Details Vulnerabilities
2 OS Linux Linux Kernel 4.14.8 Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Debian Debian Linux 1
Linux Linux Kernel 1

- References For CVE-2017-16995

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=95a762e2c8c942780948091f8f2a4f32fce1ac6f
http://www.securityfocus.com/bid/102288
BID 102288 Linux Kernel CVE-2017-16995 Local Memory Corruption Vulnerability Release Date:2017-12-22
https://bugs.chromium.org/p/project-zero/issues/detail?id=1454
https://github.com/torvalds/linux/commit/95a762e2c8c942780948091f8f2a4f32fce1ac6f
https://usn.ubuntu.com/3619-1/
UBUNTU USN-3619-1
https://usn.ubuntu.com/3619-2/
UBUNTU USN-3619-2
http://openwall.com/lists/oss-security/2017/12/21/2
https://www.exploit-db.com/exploits/45010/
EXPLOIT-DB 45010
https://www.debian.org/security/2017/dsa-4073
DEBIAN DSA-4073
https://www.exploit-db.com/exploits/45058/
EXPLOIT-DB 45058
https://usn.ubuntu.com/3633-1/
UBUNTU USN-3633-1
https://www.exploit-db.com/exploits/44298/
EXPLOIT-DB 44298
https://usn.ubuntu.com/usn/usn-3523-2/
UBUNTU USN-3523-2

- Metasploit Modules Related To CVE-2017-16995

Linux BPF Sign Extension Local Privilege Escalation
Linux kernel prior to 4.14.8 utilizes the Berkeley Packet Filter (BPF) which contains a vulnerability where it may improperly perform sign extension. This can be utilized to escalate privileges. The target system must be compiled with BPF support and must not have kernel.unprivileged_bpf_disabled set to 1. This module has been tested successfully on: Debian 9.0 kernel 4.9.0-3-amd64; Deepin 15.5 kernel 4.9.0-deepin13-amd64; ElementaryOS 0.4.1 kernel 4.8.0-52-generic; Fedora 25 kernel 4.8.6-300.fc25.x86_64; Fedora 26 kernel 4.11.8-300.fc26.x86_64; Fedora 27 kernel 4.13.9-300.fc27.x86_64; Gentoo 2.2 kernel 4.5.2-aufs-r; Linux Mint 17.3 kernel 4.4.0-89-generic; Linux Mint 18.0 kernel 4.8.0-58-generic; Linux Mint 18.3 kernel 4.13.0-16-generic; Mageia 6 kernel 4.9.35-desktop-1.mga6; Manjero 16.10 kernel 4.4.28-2-MANJARO; Solus 3 kernel 4.12.7-11.current; Ubuntu 14.04.1 kernel 4.4.0-89-generic; Ubuntu 16.04.2 kernel 4.8.0-45-generic; Ubuntu 16.04.3 kernel 4.10.0-28-generic; Ubuntu 17.04 kernel 4.10.0-19-generic; ZorinOS 12.1 kernel 4.8.0-39-generic.
Module type : exploit Rank : great Platforms : Linux


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