Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| libssh2 / libssh2 | affected 0 through 1.11.1; unaffected 5e4776146552d898b9c0e1b313cd093fa8dc92d0 |
CWE
CWE-415
References
- https://github.com/libssh2/libssh2/pull/2180
- https://github.com/libssh2/libssh2/commit/5e4776146552d898b9c0e1b313cd093fa8dc92d0
- https://www.vulncheck.com/advisories/libssh2-double-free-heap-corruption-via-sftp-open
ADP enrichment
No English description supplied.
No references supplied.