NULL pointer dereference in libssh



Published: 2020-07-29 | Updated: 2020-09-11
Risk High
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-16135
CWE-ID CWE-476
Exploitation vector Network
Public exploit N/A
Vulnerable software
Subscribe 		libssh
Universal components / Libraries / Libraries used by multiple products

Vendor libssh

Security Bulletin

This security bulletin contains information about 1 vulnerabilities.

Updated 11.09.2020

Added fixed version.

1) NULL pointer dereference

EUVDB-ID: #VU34008

Risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-16135

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error in tftpserver.c if ssh_buffer_new returns NULL. A remote attacker can perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

libssh: 0.9.4

External links

http://bugs.libssh.org/rLIBSSHe631ebb3e2247dd25e9678e6827c20dc73b73238
http://bugs.libssh.org/T232
http://gitlab.com/libssh/libssh-mirror/-/merge_requests/120
http://lists.debian.org/debian-lts-announce/2020/07/msg00034.html


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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