CVE-2019-17498
Published: 21 October 2019
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.
From the Ubuntu security team
It was discovered that libssh2 incorrectly handled bound checks in SSH_MSG_DISCONNECT. A remote attacker could possibly use this issue to cause a denial of service or obtain sensitive information.
Priority
Medium
CVSS 3 base score: 8.1
Status
| Package | Release | Status |
|---|---|---|
|
libssh2 Launchpad, Ubuntu, Debian |
Upstream |
Released
(1.9.0-1, 1.4.3-4.1+deb8u6)
|
| Ubuntu 21.04 (Hirsute Hippo) |
Not vulnerable
(1.9.0-1)
|
|
| Ubuntu 20.04 LTS (Focal Fossa) |
Needed
|
|
| Ubuntu 18.04 LTS (Bionic Beaver) |
Needed
|
|
| Ubuntu 16.04 ESM (Xenial Xerus) |
Ignored
(end of standard support, was needed)
|
|
| Ubuntu 14.04 ESM (Trusty Tahr) |
Needs triage
|
|
|
Patches: Upstream: https://github.com/libssh2/libssh2/pull/402/commits/1c6fa92b77e34d089493fe6d3e2c6c8775858b94 |
||
References
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-17498
- https://blog.semmle.com/libssh2-integer-overflow-CVE-2019-17498/
- https://github.com/kevinbackhouse/SecurityExploits/tree/8cbdbbe6363510f7d9ceec685373da12e6fc752d/libssh2/out_of_bounds_read_disconnect_CVE-2019-17498
- https://github.com/libssh2/libssh2/blob/42d37aa63129a1b2644bf6495198923534322d64/src/packet.c#L480
- https://github.com/libssh2/libssh2/pull/402/commits/1c6fa92b77e34d089493fe6d3e2c6c8775858b94
- NVD
- Launchpad
- Debian