ALT-PU-2023-4108-2

Package update libssh in branch sisyphus

Version0.9.7-alt1

Published2026-02-04

Max severityMEDIUM

Severity:

Closed issues (4)

MEDIUM6.5

Уязвимость библиотеки для аутентификации клиента LibSSH, связанная с ошибками разыменования указателя, позволяющая нарушителю вызвать отказ в обслуживании

Published: 2023-07-20Modified: 2025-03-05

CVSS 3.xMEDIUM 6.5

CVSS:3.x/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS 2.0MEDIUM 6.8

CVSS:2.0/AV:N/AC:L/Au:S/C:N/I:N/A:C

References

CVE-2023-1667

MEDIUM6.5

Уязвимость функции pki_verify_data_signature() библиотеки для аутентификации клиента LibSSH, позволяющая нарушителю обойти ограничения безопасности и получить несанкционированный доступ к защищаемой информации

Published: 2023-09-11Modified: 2025-03-05

CVSS 3.xMEDIUM 6.5

CVSS:3.x/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

CVSS 2.0MEDIUM 6.4

CVSS:2.0/AV:N/AC:L/Au:N/C:P/I:P/A:N

References

CVE-2023-2283

MEDIUM6.5

A NULL pointer dereference was found In libssh during re-keying with algorithm guessing. This issue may allow an authenticated client to cause a denial of service.

Published: 2023-05-26Modified: 2024-11-21

CVSS 3.xMEDIUM 6.5

CVSS:3.x/CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

MEDIUM6.5

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.

Published: 2023-05-26Modified: 2025-11-03

CVSS 3.xMEDIUM 6.5

CVSS:3.x/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

References