Improper Input Validation SNYK-DEBIAN8-OPENSSH-368697
Introduction
Improper input validation is a critical security vulnerability that can lead to a denial-of-service (DoS) attack. In this article, we will discuss the SNYK-DEBIAN8-OPENSSH-368697 vulnerability, which affects the OpenSSH package in Debian 8. This vulnerability allows remote attackers to cause a denial of service (crypt CPU consumption) via a long string.
NVD Description
The auth_password function in auth-passwd.c in sshd in OpenSSH before 7.3 does not limit password lengths for password authentication. This allows remote attackers to cause a denial of service (crypt CPU consumption) via a long string.
Note: Versions mentioned in the description apply only to the upstream openssh package and not the openssh package as distributed by Debian.
See How to fix? for Debian:8 relevant fixed versions and status.
Remediation
To remediate this vulnerability, you need to upgrade the OpenSSH package in Debian 8 to version 1:6.7p1-5+deb8u6 or higher.
References
The following references provide more information about the SNYK-DEBIAN8-OPENSSH-368697 vulnerability:
- https://security-tracker.debian.org/tracker/CVE-2016-6515
- https://cert-portal.siemens.com/productcert/pdf/ssa-676336.pdf
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03779en_us
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-6515
- https://lists.debian.org/debian-lts-announce/2018/09/msg00010.html
- https://www.exploit-db.com/exploits/40888/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/X2L6RW34VFNXYNVVN2CN73YAGJ5VMTFU/
- https://security.FreeBSD.org/advisories/FreeBSD-SA-17:06.openssh.asc
- https://github.com/openssh/openssh-portable/commit/fcd135c9df440bcd2d5870405ad3311743d78d97
- http://packetstormsecurity.com/files/140070/OpenSSH-7.2-Denial-Of-Service.html
- https://security.netapp.com/advisory/ntap-20171130-0003/
- http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
- http://openwall.com/lists/oss-security/2016/08/01/2
- https://access.redhat.com/errata/RHSA-2017:2029
- http://www.securityfocus.com/bid/92212
- http://www.securitytracker.com/id/1036487
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2016-6515
- https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X2L6RW34VFNXYNVVN2CN73YAGJ5VMTFU/
- https://www.exploit-db.com/exploits/40888
Impact
The SNYK-DEBIAN8-OPENSSH-368697 vulnerability allows remote attackers to cause a denial of service (crypt CPU consumption) via a long string. This can lead to a significant impact on the system, including:
- Denial of Service (DoS): The vulnerability can cause the system to become unresponsive, leading to a denial of service.
- Resource Consumption: The vulnerability can cause the system to consume excessive resources, leading to a denial of service.
- System Instability: The vulnerability can cause the system to become unstable, leading to a denial of service.
Remediation Steps
To remediate the SNYK-DEBIAN8-OPENSSH-368697 vulnerability, follow these steps:
- Upgrade OpenSSH: Upgrade the OpenSSH package in Debian 8 to version 1:6.7p1-5+deb8u6 or higher.
- Verify the Upgrade: Verify that the upgrade was successful by checking the version of OpenSSH.
- Test the System: Test the system to ensure that it is stable and functioning correctly.
Conclusion
The SNYK-DEBIAN8-OPENSSH-368697 vulnerability is a critical security vulnerability that can lead to a denial of service (DoS) attack. To remediate this vulnerability, you need to upgrade the OpenSSH package in Debian 8 to version 1:6.7p1-5+deb8u6 or higher. It is essential to follow the remediation steps carefully to ensure that the system is stable and functioning correctly.
Additional Resources
For more information about the SNYK-DEBIAN8-OPENSSH-368697 vulnerability, refer to the following resources:
- https://security-tracker.debian.org/tracker/CVE-2016-6515
- https://cert-portal.siemens.com/productcert/pdf/ssa-676336.pdf
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03779en_us
Related Vulnerabilities
The following vulnerabilities are related to the SNYK-DEBIAN8-OPENSSH-368697 vulnerability:
- https://security-tracker.debian.org/tracker/CVE-2016-6515
- https://cert-portal.siemens.com/productcert/pdf/ssa-676336.pdf
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03779en_us
Frequently Asked Questions
Q: What is the SNYK-DEBIAN8-OPENSSH-368697 vulnerability? A: The SNYK-DEBIAN8-OPENSSH-368697 vulnerability is a critical security vulnerability that can lead to a denial of service (DoS) attack.
Q: How do I remediate the SNYK-DEBIAN8-OPENSSH-368697 vulnerability? A: To remediate the SNYK-DEBIAN8-OPENSSH-368697 vulnerability, you need to upgrade the OpenSSH package in Debian 8 to version 1:6.7p1-5+deb8u6 or higher.
Q: What are
Introduction
The SNYK-DEBIAN8-OPENSSH-368697 vulnerability is a critical security vulnerability that can lead to a denial of service (DoS) attack. In this article, we will provide a Q&A section to help you understand the vulnerability and how to remediate it.
Q: What is the SNYK-DEBIAN8-OPENSSH-368697 vulnerability?
A: The SNYK-DEBIAN8-OPENSSH-368697 vulnerability is a critical security vulnerability that can lead to a denial of service (DoS) attack. It affects the OpenSSH package in Debian 8 and allows remote attackers to cause a denial of service (crypt CPU consumption) via a long string.
Q: How do I know if my system is affected by the SNYK-DEBIAN8-OPENSSH-368697 vulnerability?
A: To determine if your system is affected by the SNYK-DEBIAN8-OPENSSH-368697 vulnerability, you can check the version of OpenSSH installed on your system. If the version is less than 1:6.7p1-5+deb8u6, your system is likely affected.
Q: How do I remediate the SNYK-DEBIAN8-OPENSSH-368697 vulnerability?
A: To remediate the SNYK-DEBIAN8-OPENSSH-368697 vulnerability, you need to upgrade the OpenSSH package in Debian 8 to version 1:6.7p1-5+deb8u6 or higher. You can do this by running the following command:
sudo apt-get update
sudo apt-get install openssh-server=1:6.7p1-5+deb8u6
Q: What are the consequences of not remediating the SNYK-DEBIAN8-OPENSSH-368697 vulnerability?
A: If you do not remediate the SNYK-DEBIAN8-OPENSSH-368697 vulnerability, your system may be vulnerable to a denial of service (DoS) attack. This can lead to a significant impact on your system, including:
- Denial of Service (DoS): The vulnerability can cause the system to become unresponsive, leading to a denial of service.
- Resource Consumption: The vulnerability can cause the system to consume excessive resources, leading to a denial of service.
- System Instability: The vulnerability can cause the system to become unstable, leading to a denial of service.
Q: Can I remediate the SNYK-DEBIAN8-OPENSSH-368697 vulnerability manually?
A: Yes, you can remediate the SNYK-DEBIAN8-OPENSSH-368697 vulnerability manually by editing the OpenSSH configuration file. However, this is not recommended, as it can lead to errors and instability.
Q: Are there any other vulnerabilities related to the SNYK-DEBIAN8-OPENSSH-368697 vulnerability?
A: Yes, there are other vulnerabilities related to the SNYK-DEBIAN8-OPENSSH-368697 vulnerability. These include:
- https://security-tracker.debian.org/tracker/CVE-2016-6515
- https://cert-portal.siemens.com/product/pdf/ssa-676336.pdf
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03779en_us
Q: How can I prevent similar vulnerabilities in the future?
A: To prevent similar vulnerabilities in the future, you can:
- Regularly update your system: Regularly update your system to ensure that you have the latest security patches.
- Use a reputable security scanner: Use a reputable security scanner to identify potential vulnerabilities.
- Implement a vulnerability management program: Implement a vulnerability management program to identify and remediate vulnerabilities in a timely manner.
Q: Where can I find more information about the SNYK-DEBIAN8-OPENSSH-368697 vulnerability?
A: You can find more information about the SNYK-DEBIAN8-OPENSSH-368697 vulnerability on the following websites:
- https://security-tracker.debian.org/tracker/CVE-2016-6515
- https://cert-portal.siemens.com/productcert/pdf/ssa-676336.pdf
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03779en_us
Conclusion
The SNYK-DEBIAN8-OPENSSH-368697 vulnerability is a critical security vulnerability that can lead to a denial of service (DoS) attack. To remediate this vulnerability, you need to upgrade the OpenSSH package in Debian 8 to version 1:6.7p1-5+deb8u6 or higher. We hope this Q&A article has helped you understand the vulnerability and how to remediate it.