CVSS: 6.5EPSS: 0%CPEs: 5EXPL: 0CVE-2023-2283 – libssh: authorization bypass in pki_verify_data_signature
https://notcve.org/view.php?id=CVE-2023-2283
A vulnerability was found in libssh, where the authentication check of the connecting client can be bypassed in the`pki_verify_data_signature` function in memory allocation problems. This issue may happen if there is insufficient memory or the memory usage is limited. The problem is caused by the return value `rc,` which is initialized to SSH_ERROR and later rewritten to save the return value of the function call `pki_key_check_hash_compatible.` The value of the variable is not changed between this point and the cryptographic verification. Therefore any error between them calls `goto error` returning SSH_OK. • http://packetstormsecurity.com/files/172861/libssh-0.9.6-0.10.4-pki_verify_data_signature-Authorization-Bypass.html https://access.redhat.com/security/cve/CVE-2023-2283 https://bugzilla.redhat.com/show_bug.cgi?id=2189736 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/27PD44ALQTZXX7K6JAM3BXBUHYA6DFFN https://security.gentoo.org/glsa/202312-05 https://security.netapp.com/advisory/ntap-20240201-0005 https://www.libssh.org/security/advisories/CVE-2023-2283.txt • CWE-287: Improper Authentication •
CVSS: 6.5EPSS: 0%CPEs: 10EXPL: 0CVE-2021-3634 – libssh: possible heap-based buffer overflow when rekeying
https://notcve.org/view.php?id=CVE-2021-3634
A flaw has been found in libssh in versions prior to 0.9.6. The SSH protocol keeps track of two shared secrets during the lifetime of the session. One of them is called secret_hash and the other session_id. Initially, both of them are the same, but after key re-exchange, previous session_id is kept and used as an input to new secret_hash. Historically, both of these buffers had shared length variable, which worked as long as these buffers were same. • https://bugzilla.redhat.com/show_bug.cgi?id=1978810 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DRK67AJCWYYVAGF5SGAHNZXCX3PN3ZFP https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JKYD3ZRAMDAQX3ZW6THHUF3GXN7FF6B4 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SVWAAB2XMKEUMPMDALINKAA4U2QM4LNG https://security.gentoo.org/glsa/202312-05 https://security.netapp.com/advisory/ntap-20211004-0003 https://www&# • CWE-787: Out-of-bounds Write •
CVSS: 5.9EPSS: 0%CPEs: 8EXPL: 1CVE-2020-16135 – libssh: NULL pointer dereference in sftpserver.c if ssh_buffer_new returns NULL
https://notcve.org/view.php?id=CVE-2020-16135
libssh 0.9.4 has a NULL pointer dereference in tftpserver.c if ssh_buffer_new returns NULL. libssh versión 0.9.4, presenta una desreferencia del puntero NULL en el archivo tftpserver.c si la función ssh_buffer_new devuelve NULL A flaw was found in libssh. A NULL pointer dereference in tftpserver.c if ssh_buffer_new returns NULL. • https://bugs.libssh.org/T232 https://bugs.libssh.org/rLIBSSHe631ebb3e2247dd25e9678e6827c20dc73b73238 https://gitlab.com/libssh/libssh-mirror/-/merge_requests/120 https://lists.debian.org/debian-lts-announce/2020/07/msg00034.html https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FCIKQRKXAAB4HMWM62EPZJ4DVBHIIEG6 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JNW5GBC6JFN76VEWQXMLT5F7VCZ5AJ2E https://security.gentoo.org/glsa/202011-05 https:/ • CWE-476: NULL Pointer Dereference •
CVSS: 5.3EPSS: 0%CPEs: 9EXPL: 0CVE-2020-1730 – libssh: denial of service when handling AES-CTR (or DES) ciphers
https://notcve.org/view.php?id=CVE-2020-1730
A flaw was found in libssh versions before 0.8.9 and before 0.9.4 in the way it handled AES-CTR (or DES ciphers if enabled) ciphers. The server or client could crash when the connection hasn't been fully initialized and the system tries to cleanup the ciphers when closing the connection. The biggest threat from this vulnerability is system availability. Se detectó un fallo en libssh versiones anteriores a 0.8.9 y versiones anteriores a 0.9.4, en la manera en que se manejaron los cifrados AES-CTR (o DES si está habilitado). El servidor o el cliente podrían bloquearse cuando la conexión no ha sido inicializada completamente y el sistema intenta limpiar los cifrados cuando se cierra la conexión. • https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-1730 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2A7BIFKUYIYKTY7FX4BEWVC2OHS5DPOU https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VLSWHBQ3EPKGTGLQNH554Z746BJ3C554 https://security.netapp.com/advisory/ntap-20200424-0001 https://usn.ubuntu.com/4327-1 https://www.libssh.org/security/advisories/CVE-2020-1730.txt https://www.oracle.com/security-alerts/cpuoct2020.html https:/ • CWE-476: NULL Pointer Dereference •
CVSS: 9.3EPSS: 0%CPEs: 11EXPL: 0CVE-2019-14889 – libssh: unsanitized location in scp could lead to unwanted command execution
https://notcve.org/view.php?id=CVE-2019-14889
A flaw was found with the libssh API function ssh_scp_new() in versions before 0.9.3 and before 0.8.8. When the libssh SCP client connects to a server, the scp command, which includes a user-provided path, is executed on the server-side. In case the library is used in a way where users can influence the third parameter of the function, it would become possible for an attacker to inject arbitrary commands, leading to a compromise of the remote target. Se detectó un fallo con la función ssh_scp_new() de la API libssh en versiones anteriores a 0.9.3 y anteriores a 0.8.8. Cuando el cliente libssh SCP se conecta a un servidor, el comando scp, que incluye una ruta provista por el usuario, es ejecutado en el lado del servidor. • http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00033.html http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00047.html https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14889 https://lists.debian.org/debian-lts-announce/2019/12/msg00020.html https://lists.debian.org/debian-lts-announce/2023/05/msg00029.html https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7JJWJTXVWLLJTVHBPGWL7472S5FWXYQR https://lists.fedoraproject.org/archives/li • CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') •