axTLS up to 2.1.3 ASN.1 x509.c sig_verify Certificate signature verification

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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4.8$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in axTLS up to 2.1.3. This impacts the function sig_verify of the file x509.c of the component ASN.1 Handler. Executing a manipulation as part of Certificate can lead to signature verification. This vulnerability is registered as CVE-2018-16149. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in axTLS up to 2.1.3. It has been declared as problematic. This vulnerability affects the function sig_verify of the file x509.c of the component ASN.1 Handler. The manipulation as part of a Certificate leads to a signature verification vulnerability. The CWE definition for the vulnerability is CWE-347. The product does not verify, or incorrectly verifies, the cryptographic signature for data. As an impact it is known to affect availability. CVE summarizes:

In sig_verify() in x509.c in axTLS version 2.1.3 and before, the PKCS#1 v1.5 signature verification blindly trusts the declared lengths in the ASN.1 structure. Consequently, when small public exponents are being used, a remote attacker can generate purposefully crafted signatures (and put them on X.509 certificates) to induce illegal memory access and crash the verifier.

The bug was discovered 11/05/2018. The weakness was published 11/07/2018 (Website). The advisory is shared for download at sourceforge.net. This vulnerability was named CVE-2018-16149 since 08/29/2018. The attack can be initiated remotely. No form of authentication is required for a successful 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 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.

Similar entries are available at VDB-126521 and VDB-126522. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.8
VulDB Meta Temp Score: 4.8

VulDB Base Score: 3.7
VulDB Temp Score: 3.7
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

Class: Signature verification
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-2018-16149 (🔍)
GCVE (CVE): GCVE-0-2018-16149
GCVE (VulDB): GCVE-100-126520
See also: 🔍

Entryinfo

Created: 11/08/2018 07:45
Updated: 06/05/2023 07:10
Changes: 11/08/2018 07:45 (60), 04/10/2020 16:18 (1), 06/05/2023 07:10 (4)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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