YARA 3.5.0 libyara/lexer.l yy_get_next_buffer null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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6.1$0-$5k0.00

Summaryinfo

A vulnerability marked as problematic has been reported in YARA 3.5.0. This impacts the function yy_get_next_buffer of the file libyara/lexer.l. This manipulation causes null pointer dereference. The identification of this vulnerability is CVE-2016-10210. It is possible to initiate the attack remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability has been found in YARA 3.5.0 and classified as problematic. Affected by this vulnerability is the function yy_get_next_buffer of the file libyara/lexer.l. 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:

libyara/lexer.l in YARA 3.5.0 allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via a crafted rule that is mishandled in the yy_get_next_buffer function.

The bug was discovered 12/06/2016. The weakness was shared 04/03/2017 (GitHub Repository). The advisory is shared at github.com. This vulnerability is known as CVE-2016-10210 since 02/07/2017. 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 was handled as a non-public zero-day exploit for at least 118 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 99743 (Fedora 25 : yara (2017-11ac1e31eb)), 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 276739 (Fedora Security Update for yara (FEDORA-2017-5c55ef46ee)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 4 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (99743) and SecurityFocus (BID 98077†). The entries VDB-99230, VDB-99244, VDB-99245 and VDB-100634 are related to this item. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.1

VulDB Base Score: 5.3
VulDB Temp Score: 4.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
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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: 99743
Nessus Name: Fedora 25 : yara (2017-11ac1e31eb)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 867773
OpenVAS Name: Fedora Update for yara FEDORA-2017-9941306740
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Patch: github.com

Timelineinfo

12/06/2016 🔍
02/07/2017 +63 days 🔍
04/03/2017 +55 days 🔍
04/03/2017 +0 days 🔍
04/03/2017 +0 days 🔍
04/03/2017 +0 days 🔍
04/29/2017 +26 days 🔍
05/01/2017 +2 days 🔍
11/24/2022 +2033 days 🔍

Sourcesinfo

Advisory: FEDORA-2017-11ac1e31eb
Status: Not defined
Confirmation: 🔍

CVE: CVE-2016-10210 (🔍)
GCVE (CVE): GCVE-0-2016-10210
GCVE (VulDB): GCVE-100-99229
SecurityFocus: 98077 - YARA 'yy_get_next_buffer()' Function Denial of Service Vulnerability
OSVDB: - CVE-2016-10210 - YARA - Denial of Service Issue

See also: 🔍

Entryinfo

Created: 04/03/2017 16:53
Updated: 11/24/2022 16:36
Changes: 04/03/2017 16:53 (81), 11/24/2022 16:28 (5), 11/24/2022 16:36 (1)
Complete: 🔍
Cache ID: 216::103

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