// For flags

CVE-2016-0739

libssh: bits/bytes confusion resulting in truncated Difffie-Hellman secret length

Severity Score

5.9
*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

libssh before 0.7.3 improperly truncates ephemeral secrets generated for the (1) diffie-hellman-group1 and (2) diffie-hellman-group14 key exchange methods to 128 bits, which makes it easier for man-in-the-middle attackers to decrypt or intercept SSH sessions via unspecified vectors, aka a "bits/bytes confusion bug."

libssh en versiones anteriores a 0.7.3 trunca de manera incorrecta secretos efímeros generados para los métodos de intercambio de clave (1) diffie-hellman-group1 y (2) diffie-hellman-group14 a 128 bits, lo que hace más fácil a atacantes man-in-the-middle descifrar o interceptar sesiones SSH a través de vectores no especificados, también conocido como "bits/bytes confusion bug".

A type confusion issue was found in the way libssh generated ephemeral secrets for the diffie-hellman-group1 and diffie-hellman-group14 key exchange methods. This would cause an SSHv2 Diffie-Hellman handshake to use significantly less secure random parameters.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
Attack Vector
Network
Attack Complexity
Medium
Authentication
None
Confidentiality
Partial
Integrity
None
Availability
None
Attack Vector
Network
Attack Complexity
Medium
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2015-12-16 CVE Reserved
  • 2016-02-24 CVE Published
  • 2023-06-06 EPSS Updated
  • 2024-08-05 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
  • CWE-704: Incorrect Type Conversion or Cast
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Redhat
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 Enterprise Linux
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 7.0
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-
Affected
Canonical
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 Ubuntu Linux
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 12.04
Search vendor "Canonical" for product "Ubuntu Linux" and version "12.04"
lts
Affected
Canonical
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 Ubuntu Linux
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 14.04
Search vendor "Canonical" for product "Ubuntu Linux" and version "14.04"
lts
Affected
Canonical
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 Ubuntu Linux
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 15.10
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-
Affected
Libssh
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 Libssh
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 <= 0.7.2
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-
Affected
Fedoraproject
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 Fedora
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 22
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-
Affected
Fedoraproject
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 Fedora
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 23
Search vendor "Fedoraproject" for product "Fedora" and version "23"
-
Affected
Debian
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 Debian Linux
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 7.0
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-
Affected
Debian
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 Debian Linux
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 8.0
Search vendor "Debian" for product "Debian Linux" and version "8.0"
-
Affected