CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.4	$0-$5k	0.00

A vulnerability was found in 7-zip and p7zip (File Compression Software) (affected version unknown). It has been rated as critical. Affected by this issue is the function NCompress::NShrink::CDecoder::CodeReal of the component ZIP Archive Handler. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. Using CWE to declare the problem leads to CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Heap-based buffer overflow in the NCompress::NShrink::CDecoder::CodeReal method in 7-Zip before 18.00 and p7zip allows remote attackers to cause a denial of service (out-of-bounds write) or potentially execute arbitrary code via a crafted ZIP archive.

The bug was discovered 12/29/2017. The weakness was disclosed 01/30/2018 by Cisco with Cisco Talos (Website). The advisory is shared for download at landave.io. This vulnerability is handled as CVE-2017-17969 since 12/29/2017. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 32 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 106645 (Fedora 26 : p7zip (2018-cd4311d4d6)), 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 197397 (Ubuntu Security Notification for P7zip Vulnerabilities (USN-3913-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 1 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (106645). The entries 87306 and 87307 are pretty similar.

Productinfo

Type

• File Compression Software

Name

• 7-zip
• p7zip

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.4

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

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Out-of-bounds write
CWE: CWE-787 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	unlock	unlock	unlock	unlock
Today	unlock	unlock	unlock	unlock

Nessus ID: 106645
Nessus Name: Fedora 26 : p7zip (2018-cd4311d4d6)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 863917
OpenVAS Name: Fedora Update for p7zip FEDORA-2018-f8ad787538
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: 🔍

Timelineinfo

05/10/2016 🔍
12/29/2017 +598 days 🔍
12/29/2017 +0 days 🔍
01/30/2018 +32 days 🔍
01/30/2018 +0 days 🔍
01/31/2018 +1 days 🔍
02/06/2018 +6 days 🔍
02/07/2018 +1 days 🔍
02/03/2023 +1822 days 🔍

Sourcesinfo

Advisory: FEDORA-2018-cd4311d4d6
Researcher: Marcin ???Icewall??? Noga (Cisco)
Organization: Cisco Talos
Status: Confirmed

CVE: CVE-2017-17969 (🔍)
OVAL: 🔍

SecurityTracker: 1040831
SecurityFocus: 90531 - 7-Zip Multiple Remote Code Execution Vulnerabilities

See also: 🔍

Entryinfo

Created: 01/31/2018 09:03
Updated: 02/03/2023 09:54
Changes: 01/31/2018 09:03 (77), 12/31/2019 13:55 (5), 02/02/2021 11:36 (3), 02/02/2021 11:41 (1), 02/03/2023 09:50 (3), 02/03/2023 09:54 (1)
Complete: 🔍

Discussion

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