axTLS up to 2.1.3 PKCS #1 x509.c sig_verify Certificate Impersonation signature verification

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.
6.6$0-$5k0.00

Summaryinfo

A vulnerability has been found in axTLS up to 2.1.3 and classified as critical. Affected is the function sig_verify of the file x509.c of the component PKCS #1 Handler. The manipulation as part of Certificate leads to signature verification (Impersonation). This vulnerability is documented as CVE-2018-16150. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in axTLS up to 2.1.3. It has been rated as critical. This issue affects the function sig_verify of the file x509.c of the component PKCS #1 Handler. The manipulation as part of a Certificate leads to a signature verification vulnerability (Impersonation). Using CWE to declare the problem leads to CWE-347. The product does not verify, or incorrectly verifies, the cryptographic signature for data. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

In sig_verify() in x509.c in axTLS version 2.1.3 and before, the PKCS#1 v1.5 signature verification does not reject excess data after the hash value. Consequently, a remote attacker can forge signatures when small public exponents are being used, which could lead to impersonation through fake X.509 certificates. This is a variant of CVE-2006-4340.

The bug was discovered 11/05/2018. The weakness was released 11/07/2018 (Website). The advisory is shared at sourceforge.net. The identification of this vulnerability is CVE-2018-16150 since 08/29/2018. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 2 days. During that time the estimated underground price was around $0-$5k.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Entries connected to this vulnerability are available at VDB-126520 and VDB-126522. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.6
VulDB Meta Temp Score: 6.6

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

NVD Base Score: 5.9
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

Name: Impersonation
Class: Signature verification / Impersonation
CWE: CWE-347 / CWE-345
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: no mitigation known
Status: 🔍

0-Day Time: 🔍

Patch: github.com

Timelineinfo

08/29/2018 🔍
11/05/2018 +68 days 🔍
11/07/2018 +2 days 🔍
11/07/2018 +0 days 🔍
11/08/2018 +1 days 🔍
06/05/2023 +1670 days 🔍

Sourcesinfo

Advisory: 5efe2947ab45e81d84b5f707c51d1c64be52f36c
Status: Not defined
Confirmation: 🔍

CVE: CVE-2018-16150 (🔍)
GCVE (CVE): GCVE-0-2018-16150
GCVE (VulDB): GCVE-100-126521
See also: 🔍

Entryinfo

Created: 11/08/2018 07:45
Updated: 06/05/2023 07:15
Changes: 11/08/2018 07:45 (62), 04/10/2020 16:20 (1), 06/05/2023 07:15 (4)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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