UbuntuUSN-6560-2OpenSSH vulnerabilities
6.5 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
7.2 High
AI Score
Confidence
High
6.4 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:P/A:N
0.962 High
EPSS
Percentile
99.5%
Releases
- Ubuntu 18.04 ESM
- Ubuntu 16.04 ESM
Packages
- openssh - secure shell (SSH) for secure access to remote machines
Details
USN-6560-1 fixed several vulnerabilities in OpenSSH. This update provides
the corresponding update for Ubuntu 16.04 LTS and Ubuntu 18.04 LTS.
Original advisory details:
Fabian Bäumer, Marcus Brinkmann, Jörg Schwenk discovered that the SSH
protocol was vulnerable to a prefix truncation attack. If a remote attacker
was able to intercept SSH communications, extension negotiation messages
could be truncated, possibly leading to certain algorithms and features
being downgraded. This issue is known as the Terrapin attack. This update
adds protocol extensions to mitigate this issue. (CVE-2023-48795)
It was discovered that OpenSSH incorrectly handled user names or host names
with shell metacharacters. An attacker could possibly use this issue to
perform OS command injection. This only affected Ubuntu 18.04 LTS. (CVE-2023-51385)
| OS | Version | Architecture | Package | Version | Filename |
|---|---|---|---|---|---|
| Ubuntu | 18.04 | noarch | openssh-client | < 1:7.6p1-4ubuntu0.7+esm3 | UNKNOWN |
| Ubuntu | 18.04 | noarch | openssh-client | < 1:7.6p1-4ubuntu0.7 | UNKNOWN |
| Ubuntu | 18.04 | noarch | openssh-client-dbgsym | < 1:7.6p1-4ubuntu0.7 | UNKNOWN |
| Ubuntu | 18.04 | noarch | openssh-client-udeb | < 1:7.6p1-4ubuntu0.7 | UNKNOWN |
| Ubuntu | 18.04 | noarch | openssh-server | < 1:7.6p1-4ubuntu0.7 | UNKNOWN |
| Ubuntu | 18.04 | noarch | openssh-server-dbgsym | < 1:7.6p1-4ubuntu0.7 | UNKNOWN |
| Ubuntu | 18.04 | noarch | openssh-server-udeb | < 1:7.6p1-4ubuntu0.7 | UNKNOWN |
| Ubuntu | 18.04 | noarch | openssh-sftp-server | < 1:7.6p1-4ubuntu0.7 | UNKNOWN |
| Ubuntu | 18.04 | noarch | openssh-sftp-server-dbgsym | < 1:7.6p1-4ubuntu0.7 | UNKNOWN |
| Ubuntu | 18.04 | noarch | ssh | < 1:7.6p1-4ubuntu0.7 | UNKNOWN |
Related
6.5 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
7.2 High
AI Score
Confidence
High
6.4 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:P/A:N
0.962 High
EPSS
Percentile
99.5%