CyberRota Analysis
AI-GeneratedA double-free vulnerability in the sftp_open() function of libssh2 versions up to 1.11.1 can be exploited by a malicious SSH server to corrupt the heap of any authenticated client during an SFTP session. This flaw can lead to severe consequences, including arbitrary code execution due to memory corruption. Organizations utilizing libssh2 for SFTP operations should prioritize patching to mitigate the risk of exploitation.
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 5e47761, contains a double-free vulnerability in the sftp_open() function in src/sftp.c that allows a malicious SSH server to corrupt the heap of any authenticated client opening an SFTP session. When a server responds to SSH_FXP_OPEN with SSH_FXP_STATUS containing FX_OK, the response data buffer is freed, and if a subsequent sftp_packet_require() call returns a specific error such as LIBSSH2_ERROR_CHANNEL_PACKET_EXCEEDED, the same pointer is freed a second time, enabling tcache dup conditions on glibc systems that allow overlapping allocations and function pointer overwrites.
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