Out-of-bounds Read SNYK-DEBIAN8-LIBSSH2-340712

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NVD Description

Note: Versions mentioned in the description apply only to the upstream libssh2 package and not the libssh2 package as distributed by Debian. See How to fix? for Debian:8 relevant fixed versions and status.

An out of bounds read flaw was discovered in libssh2 before 1.8.1 in the way SSH_MSG_CHANNEL_REQUEST packets with an exit status message and no payload are parsed. A remote attacker who compromises a SSH server may be able to cause a Denial of Service or read data in the client memory.

Understanding the Vulnerability

The vulnerability in question is an out-of-bounds read flaw in the libssh2 library, which is a widely used library for implementing the SSH protocol. This flaw allows a remote attacker to cause a Denial of Service (DoS) or read data in the client memory by sending a specially crafted SSH_MSG_CHANNEL_REQUEST packet.

Impact of the Vulnerability

The impact of this vulnerability is significant, as it allows a remote attacker to potentially cause a DoS or read sensitive data from the client memory. This could lead to a range of consequences, including:

  • Denial of Service (DoS): A remote attacker could cause the SSH server to crash or become unresponsive, leading to a denial of service.
  • Data Exposure: A remote attacker could potentially read sensitive data from the client memory, including passwords, encryption keys, and other confidential information.

Remediation

To remediate this vulnerability, it is essential to upgrade the libssh2 library to a version that is not affected by this flaw. For Debian:8, the recommended version is 1.4.3-4.1+deb8u2 or higher.

Upgrade Instructions

To upgrade the libssh2 library on Debian:8, follow these steps:

  1. Update the package list: Run the command apt-get update to update the package list.
  2. Upgrade the libssh2 package: Run the command apt-get install libssh2-1=1.4.3-4.1+deb8u2 to upgrade the libssh2 package.
  3. Verify the upgrade: Run the command dpkg -l libssh2-1 to verify that the upgrade was successful.

References

The following references provide additional information on this vulnerability:

Q: What is the Out-of-bounds Read SNYK-DEBIAN8-LIBSSH2-340712 vulnerability?

A: The Out-of-bounds Read SNYK-DEBIAN8-LIBSSH2-340712 vulnerability is a security flaw in the libssh2 library that allows a remote attacker to cause a Denial of Service (DoS) or read data in the client memory.

Q: What is the impact of this vulnerability?

A: The impact of this vulnerability is significant, as it allows a remote attacker to potentially cause a DoS or read sensitive data from the client memory. This could lead to a range of consequences, including:

  • Denial of Service (DoS): A remote attacker could cause the SSH server to crash or become unresponsive, leading to a denial of service.
  • Data Exposure: A remote attacker could potentially read sensitive data from the client memory, including passwords, encryption keys, and other confidential information.

Q: How can I determine if my system is affected by this vulnerability?

A: To determine if your system is affected by this vulnerability, you can check the version of the libssh2 library installed on your system. If the version is less than 1.8.1, your system is likely affected.

Q: What can I do to remediate this vulnerability?

A: To remediate this vulnerability, you can upgrade the libssh2 library to a version that is not affected by this flaw. For Debian:8, the recommended version is 1.4.3-4.1+deb8u2 or higher.

Q: How do I upgrade the libssh2 library on Debian:8?

A: To upgrade the libssh2 library on Debian:8, follow these steps:

  1. Update the package list: Run the command apt-get update to update the package list.
  2. Upgrade the libssh2 package: Run the command apt-get install libssh2-1=1.4.3-4.1+deb8u2 to upgrade the libssh2 package.
  3. Verify the upgrade: Run the command dpkg -l libssh2-1 to verify that the upgrade was successful.

Q: Are there any other steps I need to take to remediate this vulnerability?

A: Yes, in addition to upgrading the libssh2 library, you should also take the following steps to remediate this vulnerability:

  • Review your system's configuration: Review your system's configuration to ensure that it is not vulnerable to other security flaws.
  • Apply any available patches: Apply any available patches to your system to ensure that it is up-to-date and secure.
  • Monitor your system for suspicious activity: Monitor your system for suspicious activity and take action if you detect any signs of a security breach.

Q: Can I prevent this vulnerability from occurring in the future?

A: Yes, you can prevent this vulnerability from occurring in the future by:

  • Keeping your system up-to-date: Regularly update your system to ensure that it has the latest security patches and updates.
  • Using a secure SSH client: Use a secure SSH client that is not vulnerable to this flaw.
  • Implementing additional security measures: Implement additional security measures, such as firewalls and intrusion detection systems, to protect your system from security threats.

Q: Where can I find more information about this vulnerability?

A: You can find more information about this vulnerability on the following websites: