Linux Kernel up to 4.14.8 Extended BPF Verifier kernel/bpf/verifier.c information disclosure

CVSS Meta Temp Score
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CTI Interest Score
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3.1$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 4.14.8. It has been declared as problematic. This vulnerability affects unknown code of the file kernel/bpf/verifier.c of the component Extended BPF Verifier. Such manipulation leads to information disclosure. This vulnerability is documented as CVE-2017-17864. The attack needs to be performed locally. There is not any exploit available. A patch should be applied to remediate this issue.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Linux Kernel up to 4.14.8 (Operating System). Affected by this issue is some unknown processing of the file kernel/bpf/verifier.c of the component Extended BPF Verifier. The manipulation with an unknown input leads to a information disclosure vulnerability. Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality. CVE summarizes:

kernel/bpf/verifier.c in the Linux kernel through 4.14.8 mishandles states_equal comparisons between the pointer data type and the UNKNOWN_VALUE data type, which allows local users to obtain potentially sensitive address information, aka a "pointer leak."

The bug was discovered 12/23/2017. The weakness was released 12/19/2017 by Jann Horn as not defined commit (GitHub Repository). The advisory is available at github.com. This vulnerability is handled as CVE-2017-17864 since 12/23/2017. Local access is required to approach this attack. Required for exploitation is a simple authentication. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1592 by the MITRE ATT&CK project. The following code is the reason for this vulnerability: 

return rold->umin_value == 0 &&
   rold->umax_value == U64_MAX &&
   rold->smin_value == S64_MIN &&
   rold->smax_value == S64_MAX &&
   tnum_is_unknown(rold->var_off);

The vulnerability scanner Nessus provides a plugin with the ID 105433 (Debian DSA-4073-1 : linux - security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 197013 (Ubuntu Security Notification for Linux Vulnerabilities (USN-3523-1) (Meltdown)).

Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. A possible mitigation has been published immediately after the disclosure of the vulnerability. The vulnerability will be addressed with the following lines of code:

return false;

The vulnerability is also documented in the databases at Tenable (105433), SecurityFocus (BID 102320†) and SecurityTracker (ID 1040059†). Entries connected to this vulnerability are available at VDB-110931, VDB-110932, VDB-110933 and VDB-111024. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.3
VulDB Meta Temp Score: 3.1

VulDB Base Score: 3.3
VulDB Temp Score: 2.9
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 3.3
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Information disclosure
CWE: CWE-200 / CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 105433
Nessus Name: Debian DSA-4073-1 : linux - security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 103137
OpenVAS Name: Panda Global Protection System Crash DoS Vulnerability
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

Patch: github.com

Timelineinfo

12/19/2017 🔍
12/19/2017 +0 days 🔍
12/23/2017 +4 days 🔍
12/23/2017 +0 days 🔍
12/23/2017 +0 days 🔍
12/26/2017 +3 days 🔍
12/26/2017 +0 days 🔍
12/27/2017 +1 days 🔍
12/28/2017 +1 days 🔍
01/19/2023 +1848 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: usn-3523-2
Researcher: Jann Horn
Status: Not defined

CVE: CVE-2017-17864 (🔍)
GCVE (CVE): GCVE-0-2017-17864
GCVE (VulDB): GCVE-100-111026

OVAL: 🔍

SecurityFocus: 102320 - Linux Kernel 'kernel/bpf/verifier.c' Local Information Disclosure Vulnerability
SecurityTracker: 1040059

See also: 🔍

Entryinfo

Created: 12/28/2017 09:34
Updated: 01/19/2023 07:50
Changes: 12/28/2017 09:34 (70), 12/17/2019 19:48 (10), 01/28/2021 08:13 (10), 01/19/2023 07:45 (3), 01/19/2023 07:50 (1)
Complete: 🔍
Cache ID: 216::103

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