// For flags

CVE-2024-39894

Ubuntu Security Notice USN-6887-1

Severity Score

7.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track*
*SSVC
Descriptions

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.

OpenSSH 9.5 a 9.7 anterior a 9.8 a veces permite ataques de sincronización contra la entrada de contraseña sin eco (por ejemplo, para su y Sudo) debido a un error lógico de ObscureKeystrokeTiming. De manera similar, podrían ocurrir otros ataques de sincronización contra la entrada de teclas.

Philippos Giavridis, Jacky Wei En Kung, Daniel Hugenroth, and Alastair Beresford discovered that the OpenSSH ObscureKeystrokeTiming feature did not work as expected. A remote attacker could possibly use this issue to determine timing information about keystrokes.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Network
Attack Complexity
High
Authentication
None
Confidentiality
Complete
Integrity
None
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:Track*
Exploitation
None
Automatable
No
Tech. Impact
Total
* Organization's Worst-case Scenario
Timeline
  • 2024-07-02 CVE Reserved
  • 2024-07-02 CVE Published
  • 2025-01-29 CVE Updated
  • 2025-04-15 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Openbsd
Search vendor "Openbsd"
 Openssh
Search vendor "Openbsd" for product "Openssh"
*-
Affected
Canonical
Search vendor "Canonical"
 Ubuntu Linux
Search vendor "Canonical" for product "Ubuntu Linux"
*-
Affected
Opensuse
Search vendor "Opensuse"
 Leap
Search vendor "Opensuse" for product "Leap"
*-
Affected
Suse
Search vendor "Suse"
 Sle-module-basesystem
Search vendor "Suse" for product "Sle-module-basesystem"
*-
Affected
Suse
Search vendor "Suse"
 Sle-module-desktop-applications
Search vendor "Suse" for product "Sle-module-desktop-applications"
*-
Affected