CyberRota Analysis
AI-GeneratedLibssh2 versions up to 1.11.1 are vulnerable to a pre-authentication heap buffer overflow that can be exploited by a malicious SSH server to corrupt heap metadata in connecting clients. This vulnerability can lead to severe consequences, including arbitrary code execution and system compromise, particularly on 32-bit glibc systems. Organizations using affected versions of libssh2 should prioritize patching to mitigate the risk of exploitation during SSH session handshakes.
Public Exploit Signal
A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.
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Original NVD Description
libssh2 through 1.11.1, fixed in commit 42e33d8, contains a pre-authentication heap buffer overflow vulnerability that allows a malicious SSH server to corrupt heap metadata in any connecting client by sending a packet with a packet_length smaller than the cipher's block size during Encrypt-then-MAC cipher negotiation. In the fullpacket() function in src/transport.c, the ETM path allocates a buffer of packet_length bytes but copies blocksize minus one bytes via memcpy, causing an overflow that on 32-bit glibc writes attacker-controlled bytes into an adjacent chunk's SIZE field, enabling tcache bin confusion, overlapping live objects, and function pointer overwrite during the session handshake before authentication.
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