Tag: tls
4 articles
OpenSSL Flaw Exposes Servers to Memory Exhaustion Attacks
A newly discovered OpenSSL flaw, dubbed HollowByte, leaves unpatched servers vulnerable to memory exhaustion attacks, where a mere 11 bytes can trigger the allocation of up to 131 KB of memory for a message that never arrives. This tiny trigger can bring a server to its knees, freezing memory and blocking critical connections.
OpenSSL Servers Vulnerable to Memory-Bloating DDoS Attacks
Beware: a simple 11-byte malicious input can cripple OpenSSL servers with a devastating DDoS attack, leaving them permanently bloated and vulnerable. This sneaky exploit, dubbed HollowByte, takes advantage of a weakness in OpenSSL's TLS handshake to drain server resources.
Weak RSA Keys Exposed in Widespread Use
Meet the badkeys project, an open-source service that scans public keys for vulnerabilities, which recently uncovered a surprising pattern of weak RSA keys in widespread use. By analyzing a massive dataset of real-world public keys, the team discovered a substantial number of keys with a suspicious structure, featuring regularly spaced blocks of zero bits and random data.
Exim BDAT Flaw Exposes GnuTLS Builds to Code Execution Risk
A newly discovered vulnerability, dubbed Dead.Letter, threatens Exim builds that use GnuTLS, allowing attackers to exploit a use-after-free flaw in BDAT handling and potentially execute malicious code. This critical flaw can be triggered when a specific sequence of BDAT and TLS commands is sent, leading to heap corruption and a heightened risk of code execution.