OpenSSH 9.5/9.6/9.7 echo-off Password Entry ObscureKeystrokeTiming timing discrepancy

CVSS Meta Temp Score
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CTI Interest Score
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5.0$0-$5k0.72

Summaryinfo

A vulnerability marked as critical has been reported in OpenSSH 9.5/9.6/9.7. Impacted is the function ObscureKeystrokeTiming of the component echo-off Password Entry Handler. This manipulation causes timing discrepancy. This vulnerability appears as CVE-2024-39894. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in OpenSSH 9.5/9.6/9.7. Affected by this vulnerability is the function ObscureKeystrokeTiming of the component echo-off Password Entry Handler. The manipulation with an unknown input leads to a timing discrepancy vulnerability. The CWE definition for the vulnerability is CWE-208. Two separate operations in a product require different amounts of time to complete, in a way that is observable to an actor and reveals security-relevant information about the state of the product, such as whether a particular operation was successful or not. As an impact it is known to affect confidentiality. The summary by CVE is:

OpenSSH 9.5 through 9.7 before 9.8 sometimes allows timing attacks against echo-off password entry (e.g., for su and Sudo) because of an ObscureKeystrokeTiming logic error. Similarly, other timing attacks against keystroke entry could occur.

The advisory is shared at lists.mindrot.org. This vulnerability is known as CVE-2024-39894. The exploitation appears to be difficult. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1592 for this issue.

Upgrading to version 9.8 eliminates this vulnerability. The upgrade is hosted for download at openssh.com.

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Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.0
VulDB Meta Temp Score: 5.0

VulDB Base Score: 2.6
VulDB Temp Score: 2.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA Base Score: 7.5
CNA Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Timing discrepancy
CWE: CWE-208 / CWE-203 / CWE-200
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: 🔍

0-Day Time: 🔍

Upgrade: OpenSSH 9.8

Timelineinfo

07/02/2024 🔍
07/02/2024 +0 days 🔍
07/08/2024 +6 days 🔍

Sourcesinfo

Advisory: lists.mindrot.org
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2024-39894 (🔍)
GCVE (CVE): GCVE-0-2024-39894
GCVE (VulDB): GCVE-100-270253

Entryinfo

Created: 07/02/2024 20:51
Updated: 07/08/2024 18:59
Changes: 07/02/2024 20:51 (56), 07/08/2024 18:59 (12)
Complete: 🔍
Cache ID: 216::103

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