CVE-2019-17498

Description

In libssh2 v1.9.0 and earlier versions, the SSH_MSG_DISCONNECT logic in packet.c has an integer overflow in a bounds check, enabling an attacker to specify an arbitrary (out-of-bounds) offset for a subsequent memory read. A crafted SSH server may be able to disclose sensitive information or cause a denial of service condition on the client system when a user connects to the server.

CVSS breakdown

Affected products

• Debian / debian_linux9.0 – 9.0
• Debian / debian_linux8.0 – 8.0
• fedoraproject / fedora30 – 30
• fedoraproject / fedora31 – 31
• libssh2 / libssh21.9.0
• NetApp / active_iq_unified_manager
• NetApp / bootstrap_os
• NetApp / element_software
• NetApp / hci_management_node
• NetApp / ONTAP Select Deploy administration utility
• NetApp / solidfire
• openSUSE / Leap15.1 – 15.1

References

• MISChttps://github.com/libssh2/libssh2/blob/42d37aa63129a1b2644bf6495198923534322d64/src/packet.c#L480
• MISChttps://blog.semmle.com/libssh2-integer-overflow-CVE-2019-17498/
• MISChttps://github.com/kevinbackhouse/SecurityExploits/tree/8cbdbbe6363510f7d9ceec685373da12e6fc752d/libssh2/out_of_bounds_read_disconnect_CVE-2019-17498
• MAILING_LISThttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TY7EEE34RFKCTXTMBQQWWSLXZWSCXNDB/
• MAILING_LISThttp://lists.opensuse.org/opensuse-security-announce/2019-11/msg00026.html
• MAILING_LISThttps://lists.debian.org/debian-lts-announce/2019/11/msg00010.html
• MAILING_LISThttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/22H4Q5XMGS3QNSA7OCL3U7UQZ4NXMR5O/
• PATCHhttps://github.com/libssh2/libssh2/commit/dedcbd106f8e52d5586b0205bc7677e4c9868f9c
• MAILING_LISThttps://lists.debian.org/debian-lts-announce/2021/12/msg00013.html
• MISChttps://security.netapp.com/advisory/ntap-20220909-0004/
• EXPLOIThttp://packetstormsecurity.com/files/172835/libssh2-1.9.0-Out-Of-Bounds-Read.html
• MAILING_LISThttps://lists.debian.org/debian-lts-announce/2023/09/msg00006.html