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	0.05

A vulnerability was found in zlib 1.2.8 and classified as problematic. This issue affects the function crc32_big in the library zlib of the file crc32.c of the component CRC Calculation. The manipulation with an unknown input leads to a numeric error vulnerability. Using CWE to declare the problem leads to CWE-189. Impacted is availability. The summary by CVE is:

The crc32_big function in crc32.c in zlib 1.2.8 might allow context-dependent attackers to have unspecified impact via vectors involving big-endian CRC calculation.

The bug was discovered 12/05/2016. The weakness was released 05/23/2017 with Trail of Bits/TrustInSoft (oss-sec). It is possible to read the advisory at openwall.com. The identification of this vulnerability is CVE-2016-9843 since 12/05/2016. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability was handled as a non-public zero-day exploit for at least 49 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 96691 (GLSA-201701-56 : zlib: Multiple vulnerabilities), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Gentoo Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 171691 (SUSE Enterprise Linux Security Update for mysql (SUSE-SU-2018:3542-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published before and not just after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (96691). Entries connected to this vulnerability are available at 101648, 101649, 101650 and 104096.

Productinfo

Name

• zlib

Version

• 1.2.8

License

• open-source

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: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
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: Numeric error
CWE: CWE-189
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: 96691
Nessus Name: GLSA-201701-56 : zlib: Multiple vulnerabilities
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 802684
OpenVAS Name: IBM Tivoli Entpoint Manager Multiple Vulnerabilities July17
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Patch: github.com

Timelineinfo

12/04/2016 🔍
12/05/2016 +1 days 🔍
12/05/2016 +0 days 🔍
01/23/2017 +49 days 🔍
01/23/2017 +0 days 🔍
05/23/2017 +120 days 🔍
05/23/2017 +0 days 🔍
05/23/2017 +0 days 🔍
12/07/2022 +2024 days 🔍

Sourcesinfo

Advisory: RHSA-2017:1220
Researcher: Trail
Organization: Trail of Bits/TrustInSoft
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-9843 (🔍)
OVAL: 🔍

SecurityTracker: 1039427
SecurityFocus: 95131 - zlib Multiple Denial of Service Vulnerabilities
OSVDB: - CVE-2016-9843 - zlib - Denial of Service Issue

See also: 🔍

Entryinfo

Created: 05/23/2017 12:46
Updated: 12/07/2022 08:42
Changes: 05/23/2017 12:46 (78), 10/02/2020 09:36 (5), 12/25/2020 14:25 (2), 12/25/2020 14:29 (1), 12/07/2022 08:42 (4)
Complete: 🔍

Discussion

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