VDB-92548 · CVE-2016-4407 · BID 93502

SAP SAPCRYPTOLIB 5.555.38 Signature Check access control

CVSS Meta Temp Score
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Current Exploit Price (≈)
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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.
6.0$0-$5k0.00

Summaryinfo

A vulnerability categorized as problematic has been discovered in SAP SAPCRYPTOLIB 5.555.38. Impacted is an unknown function of the component Signature Check Handler. Executing a manipulation can lead to access control. This vulnerability appears as CVE-2016-4407. The attack may be performed from remote. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in SAP SAPCRYPTOLIB 5.555.38. This vulnerability affects an unknown functionality of the component Signature Check Handler. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. As an impact it is known to affect integrity, and availability. CVE summarizes:

The DSA algorithm implementation in SAP SAPCRYPTOLIB 5.555.38 does not properly check signatures, which allows remote authenticated users to impersonate arbitrary users via unspecified vectors, aka SAP Security Note 2223008.

The weakness was presented 10/11/2016 by Fernando Russ, Pablo Artuso and Sergio Abraham as not defined mailinglist post (Full-Disclosure). The advisory is shared for download at seclists.org. This vulnerability was named CVE-2016-4407 since 04/29/2016. The exploitation appears to be difficult. The attack can be initiated remotely. The successful exploitation needs a single authentication. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1068.

The vulnerability was handled as a non-public zero-day exploit for at least 350 days. During that time the estimated underground price was around $5k-$25k.

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 SecurityFocus (BID 93502†). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.2

VulDB Base Score: 6.5
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
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: Access control
CWE: CWE-284 / CWE-266
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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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍

Timelineinfo

11/27/2014 🔍
11/28/2014 +1 days 🔍
11/12/2015 +349 days 🔍
04/29/2016 +169 days 🔍
09/22/2016 +146 days 🔍
10/11/2016 +19 days 🔍
10/12/2016 +1 days 🔍
10/13/2016 +1 days 🔍
05/07/2019 +936 days 🔍

Sourcesinfo

Vendor: sap.com

Advisory: seclists.org
Researcher: Fernando Russ, Pablo Artuso, Sergio Abraham
Status: Not defined

CVE: CVE-2016-4407 (🔍)
GCVE (CVE): GCVE-0-2016-4407
GCVE (VulDB): GCVE-100-92548
SecurityFocus: 93502 - SAP SAPCRYPTOLIB Component CVE-2016-4407 Security Bypass Vulnerability

scip Labs: https://www.scip.ch/en/?labs.20150716

Entryinfo

Created: 10/12/2016 10:07
Updated: 05/07/2019 16:53
Changes: 10/12/2016 10:07 (56), 05/07/2019 16:53 (12)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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