CVE-2019-13115
Published: 16 July 2019
In libssh2 before 1.9.0, kex_method_diffie_hellman_group_exchange_sha256_key_exchange in kex.c has an integer overflow that could lead to an out-of-bounds read in the way packets are read from the server. A remote attacker who compromises a 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. This is related to an _libssh2_check_length mistake, and is different from the various issues fixed in 1.8.1, such as CVE-2019-3855.
From the Ubuntu Security Team
It was discovered that libssh2 incorrectly handled Diffie Hellman key exchange. A remote attacker could possibly use this issue to cause a denial of service or obtain sensitive information.
Priority
Status
| Package | Release | Status |
|---|---|---|
|
libssh2 Launchpad, Ubuntu, Debian |
bionic |
Needed
|
| cosmic |
Ignored
(end of life)
|
|
| disco |
Ignored
(end of life)
|
|
| eoan |
Ignored
(end of life)
|
|
| focal |
Needed
|
|
| groovy |
Ignored
(end of life)
|
|
| hirsute |
Not vulnerable
(1.9.0-1)
|
|
| impish |
Not vulnerable
(1.9.0-1)
|
|
| jammy |
Not vulnerable
(1.9.0-1)
|
|
| kinetic |
Not vulnerable
(1.9.0-1)
|
|
| lunar |
Not vulnerable
(1.9.0-1)
|
|
| mantic |
Not vulnerable
(1.9.0-1)
|
|
| trusty |
Released
(1.4.3-2ubuntu0.2+esm2)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only) |
|
| upstream |
Released
(1.9.0, 1.4.3-4.1+deb8u4)
|
|
| xenial |
Released
(1.5.0-2ubuntu0.1+esm1)
Available with Ubuntu Pro |
|
|
Patches: upstream: https://github.com/libssh2/libssh2/commit/ff1b155731ff8f790f12d980911d9fd84d0e1598 |
||
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 8.1 |
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | Required |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | None |
| Availability impact | High |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H |