Anolis OS update for openssh
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 2 |
| CVE-ID | CVE-2017-15906 CVE-2018-15473 |
| CWE-ID | CWE-264 CWE-388 |
| Exploitation vector | Network |
| Public exploit | Public exploit code for vulnerability #2 is available. |
| Vulnerable software |
Anolis OS Operating systems & Components / Operating system pam_ssh_agent_auth Operating systems & Components / Operating system package or component openssh-server-sysvinit Operating systems & Components / Operating system package or component openssh-server Operating systems & Components / Operating system package or component openssh-ldap Operating systems & Components / Operating system package or component openssh-keycat Operating systems & Components / Operating system package or component openssh-clients Operating systems & Components / Operating system package or component openssh-cavs Operating systems & Components / Operating system package or component openssh-askpass Operating systems & Components / Operating system package or component openssh Operating systems & Components / Operating system package or component |
| Vendor | OpenAnolis |
Security Bulletin
This security bulletin contains information about 2 vulnerabilities.
1) Denial of service
EUVDB-ID: #VU9333
Risk: Low
CVSSv4.0: 4.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2017-15906
CWE-ID:
CWE-264 - Permissions, Privileges, and Access Controls
Exploit availability: No
DescriptionThe vulnerability allows a remote authenticated attacker to cause DoS condition on the target system.
The weakness exists in the process_open() function due to improper prevention of write operations in read-only mode. A remote attacker can create zero-length files and cause the service to crash.
Successful exploitation of the vulnerability results in denial of service.
Install updates from vendor's repository.
Vulnerable software versionsAnolis OS: 7
pam_ssh_agent_auth: before 0.10.3-2.21
openssh-server-sysvinit: before 7.4p1-21
openssh-server: before 7.4p1-21
openssh-ldap: before 7.4p1-21
openssh-keycat: before 7.4p1-21
openssh-clients: before 7.4p1-21
openssh-cavs: before 7.4p1-21
openssh-askpass: before 7.4p1-21
openssh: before 7.4p1-21
CPE2.3- cpe:2.3:o:openanolis:anolis_os:7:*:*:*:*:*:*:*
- cpe:2.3:o:openanolis:pam_ssh_agent_auth:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:o:openanolis:openssh-server-sysvinit:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:o:openanolis:openssh-server:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:o:openanolis:openssh-ldap:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:o:openanolis:openssh-keycat:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:o:openanolis:openssh-clients:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:o:openanolis:openssh-cavs:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:o:openanolis:openssh-askpass:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:o:openanolis:openssh:*:*:*:*:*:anolis_os:*:*
https://anas.openanolis.cn/errata/detail/ANSA-2022:0816
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
2) User enumeration
EUVDB-ID: #VU14440
Risk: Medium
CVSSv4.0: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:A/U:Green]
CVE-ID: CVE-2018-15473
CWE-ID:
CWE-388 - Error Handling
Exploit availability: Yes
DescriptionThe vulnerability allows a remote attacker to enumerate all accounts on the system.
The vulnerability exists due to a logical error in auth2-gss.c, auth2-hostbased.c, and auth2-pubkey.c files when processing authentication requests. A remote attacker can send a specially crafted chain of packets and monitor behavior of openssh server to determine presence of a valid username. The server will drop connection upon receiving a malformed authentication packets if the username is valid.
MitigationInstall updates from vendor's repository.
Vulnerable software versionsAnolis OS: 7
pam_ssh_agent_auth: before 0.10.3-2.21
openssh-server-sysvinit: before 7.4p1-21
openssh-server: before 7.4p1-21
openssh-ldap: before 7.4p1-21
openssh-keycat: before 7.4p1-21
openssh-clients: before 7.4p1-21
openssh-cavs: before 7.4p1-21
openssh-askpass: before 7.4p1-21
openssh: before 7.4p1-21
CPE2.3- cpe:2.3:o:openanolis:anolis_os:7:*:*:*:*:*:*:*
- cpe:2.3:o:openanolis:pam_ssh_agent_auth:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:o:openanolis:openssh-server-sysvinit:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:o:openanolis:openssh-server:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:o:openanolis:openssh-ldap:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:o:openanolis:openssh-keycat:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:o:openanolis:openssh-clients:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:o:openanolis:openssh-cavs:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:o:openanolis:openssh-askpass:*:*:*:*:*:anolis_os:*:*
- cpe:2.3:o:openanolis:openssh:*:*:*:*:*:anolis_os:*:*
https://anas.openanolis.cn/errata/detail/ANSA-2022:0816
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability. However, a fully functional exploit for this vulnerability is available.
