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mageiaGentoo FoundationMGASA-2024-0002
HistoryJan 08, 2024 - 1:12 p.m.

Updated libssh2 packages fix a security vulnerability (Terrapin Attack)

2024-01-0813:12:44
Gentoo Foundation
advisories.mageia.org
51
ssh transport protocol
openssh extensions
integrity checks
remote attackers
terrapin attack
security features
connection downgraded
handshake phase
sequence numbers
libssh2 packages
update
vulnerability
unix

CVSS3

5.9

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

AI Score

6.1

Confidence

High

EPSS

0.965

Percentile

99.6%

The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6 and other products, allows remote attackers to bypass integrity checks such that some packets are omitted (from the extension negotiation message), and a client and server may consequently end up with a connection for which some security features have been downgraded or disabled, aka a Terrapin attack. This occurs because the SSH Binary Packet Protocol (BPP), implemented by these extensions, mishandles the handshake phase and mishandles use of sequence numbers. Our libssh2 packages were also affected, this update fixes the issue.

OSVersionArchitecturePackageVersionFilename
Mageia9noarchlibssh2< 1.10.0-3.1libssh2-1.10.0-3.1.mga9

CVSS3

5.9

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

AI Score

6.1

Confidence

High

EPSS

0.965

Percentile

99.6%