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RegreSSHion is a family of security bugs in the OpenSSH software that allows for an attacker to remotely execute code and gain potential root access on a machine running the OpenSSH Server. [1] [2] The vulnerability was discovered by the Qualys Threat Research Unit and was disclosed on July 1, 2024.
The issue has been given the Common Vulnerabilities and Exposures number CVE-2024-3094 and has been assigned a CVSS score of 10.0, the highest possible score. [ 5 ] While xz is commonly present in most Linux distributions , at the time of discovery the backdoored version had not yet been widely deployed to production systems, but was present in ...
The designers of SSH have implemented a fix for the Terrapin attack, but the fix is only fully effective when both client and server implementations have been upgraded to support it. [1] The researchers who discovered the attack have also created a vulnerability scanner to determine whether an SSH server or client is vulnerable. [8]
There are a number of online services which attempt to test the vulnerability against web servers exposed to the Internet. [citation needed] OpenSSH server OpenSSH has a "ForceCommand" feature, where a fixed command is executed when the user logs in, instead of just running an unrestricted command shell. The fixed command is executed even if ...
The same month, another vulnerability was discovered that allowed a malicious server to forward a client authentication to another server. [ 47 ] Since SSH-1 has inherent design flaws which make it vulnerable, it is now generally considered obsolete and should be avoided by explicitly disabling fallback to SSH-1. [ 47 ]
Malicious or compromised OpenSSH servers could read sensitive information on the client such as private login keys for other systems, using a vulnerability that relies on the undocumented connection-resuming feature of the OpenSSH client, which is called roaming, enabled by default on the client, but not supported on the OpenSSH server.
After the vulnerability is patched, server administrators must address the potential breach of confidentiality. Because Heartbleed allowed attackers to disclose private keys , they must be treated as compromised; key pairs must be regenerated, and certificates that use them must be reissued; the old certificates must be revoked .
Logjam is a security vulnerability in systems that use Diffie–Hellman key exchange with the same prime number. It was discovered by a team of computer scientists and publicly reported on May 20, 2015. [1] The discoverers were able to demonstrate their attack on 512-bit (US export-grade) DH systems. They estimated that a state-level attacker ...