HelpSystems tcpcrypt up to 6.7.1 on Linux memory corruption

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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8.5$0-$5k0.00

Summaryinfo

A vulnerability has been found in HelpSystems tcpcrypt up to 6.7.1 on Linux and classified as critical. Affected is an unknown function. The manipulation leads to memory corruption. This vulnerability is traded as CVE-2018-20764. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in HelpSystems tcpcrypt up to 6.7.1 on Linux. It has been rated as critical. This issue affects an unknown part. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

A buffer overflow exists in HelpSystems tcpcrypt on Linux, used for BoKS encrypted telnet through BoKS version 6.7.1. Since tcpcrypt is setuid, exploitation leads to privilege escalation.

The bug was discovered 05/25/2018. The weakness was shared 02/08/2019 (Website). It is possible to read the advisory at community.helpsystems.com. The identification of this vulnerability is CVE-2018-20764 since 02/08/2019. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 259 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.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.5
VulDB Meta Temp Score: 8.5

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

NVD Base Score: 9.8
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: Memory corruption
CWE: CWE-119
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: 🔍

Timelineinfo

05/25/2018 🔍
02/08/2019 +259 days 🔍
02/08/2019 +0 days 🔍
02/09/2019 +1 days 🔍
05/09/2020 +455 days 🔍

Sourcesinfo

Advisory: community.helpsystems.com
Status: Not defined
Confirmation: 🔍

CVE: CVE-2018-20764 (🔍)
GCVE (CVE): GCVE-0-2018-20764
GCVE (VulDB): GCVE-100-130679

Entryinfo

Created: 02/09/2019 10:32
Updated: 05/09/2020 12:17
Changes: 02/09/2019 10:32 (55), 05/09/2020 12:17 (2)
Complete: 🔍
Cache ID: 216::103

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