libssh libssh CVE-2020-1730 vulnerability in Libssh and Other Products
Published on April 13, 2020

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A flaw was found in libssh versions before 0.8.9 and before 0.9.4 in the way it handled AES-CTR (or DES ciphers if enabled) ciphers. The server or client could crash when the connection hasn't been fully initialized and the system tries to cleanup the ciphers when closing the connection. The biggest threat from this vulnerability is system availability.

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Vulnerability Analysis

CVE-2020-1730 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a small impact on availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
NONE
Integrity Impact:
NONE
Availability Impact:
LOW

Weakness Type

NULL Pointer Dereference

A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. NULL pointer dereference issues can occur through a number of flaws, including race conditions, and simple programming omissions.


Products Associated with CVE-2020-1730

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2020-1730 are published in these products:

Libssh
 
Fedora Project Fedora
 
Red Hat Enterprise Linux (RHEL)
 
Oracle Mysql Workbench
 
Canonical Ubuntu Linux
 
NetApp Cloud Backup
 

Affected Versions

Red Hat libssh:

Exploit Probability

EPSS
0.08%
Percentile
22.68%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.