Juniper Junos OS update for OpenSSH
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 8 |
| CVE-ID | CVE-2015-8325 CVE-2016-6210 CVE-2016-6515 CVE-2015-6564 CVE-2016-10009 CVE-2016-10010 CVE-2016-10011 CVE-2016-10012 |
| CWE-ID | CWE-264 CWE-200 CWE-400 CWE-416 CWE-20 CWE-119 |
| Exploitation vector | Network |
| Public exploit |
Public exploit code for vulnerability #2 is available. Public exploit code for vulnerability #3 is available. Public exploit code for vulnerability #4 is available. Public exploit code for vulnerability #5 is available. Public exploit code for vulnerability #6 is available. |
| Vulnerable software |
Juniper Junos OS Operating systems & Components / Operating system |
| Vendor | Juniper Networks, Inc. |
Security Bulletin
This security bulletin contains information about 8 vulnerabilities.
1) Incorrect handling of environment files
EUVDB-ID: #VU251
Risk: Low
CVSSv4.0: 5.8 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:U/U:Clear]
CVE-ID: CVE-2015-8325
CWE-ID:
CWE-264 - Permissions, Privileges, and Access Controls
Exploit availability: No
DescriptionThe vulnerability allows a local user to execute arbitrary code on the target system.
The vulnerability exists in portable version of OpenSSH. A local user can execute arbitrary code as root by setting specially crafted environment variables to conduct attacks against the 'bin/login' process on systems, where PAM is configured to read user-specified environment variables and 'sshd_config' is set to 'UseLogin=yes'.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Mitigation
Install updates from vendor's website.
Juniper Junos OS: 12.3R10 - 17.2
CPE2.3- cpe:2.3:o:juniper_networks:juniper_junos_os:12.3:*:*:*:*:*:*:*
- cpe:2.3:o:juniper_networks:juniper_junos_os:15.1:*:*:*:*:*:*:*
- cpe:2.3:o:juniper_networks:juniper_junos_os:16.1:*:*:*:*:*:*:*
- cpe:2.3:o:juniper_networks:juniper_junos_os:16.2:*:*:*:*:*:*:*
- cpe:2.3:o:juniper_networks:juniper_junos_os:17.1:*:*:*:*:*:*:*
- cpe:2.3:o:juniper_networks:juniper_junos_os:17.2:*:*:*:*:*:*:*
https://kb.juniper.net/InfoCenter/index?page=content&id=JSA10940&cat=SIRT_1&actp=LIST
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
2) User enumeration via covert timing channel
EUVDB-ID: #VU255
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-2016-6210
CWE-ID:
CWE-200 - Information exposure
Exploit availability: Yes
DescriptionThe vulnerability allows a remote attacker to enumerate users on system.
The vulnerability exists in most systems where the Blowfish algorithm runs faster than SHA256/SHA512. A remote unauthenticated attacker can determine valid usernames by sending a specially crafted request with a large password (approximately 10,000 characters) to the target ssh daemon. On systems where a valid user's password has been hashed with SHA256/SHA512, the response time will be shorter for a non-existent username than for a valid username.
Successful exploitation of this vulnerability may result in disclosure or user logins.
MitigationInstall updates from vendor's website.
Juniper Junos OS: 12.3R10 - 17.2
CPE2.3https://kb.juniper.net/InfoCenter/index?page=content&id=JSA10940&cat=SIRT_1&actp=LIST
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.
3) Consuming excessive CPU resources on the target system
EUVDB-ID: #VU252
Risk: Medium
CVSSv4.0: 7.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/U:Green]
CVE-ID: CVE-2016-6515
CWE-ID:
CWE-400 - Resource exhaustion
Exploit availability: Yes
DescriptionThe vulnerability allows a remote attacker to consume excessive CPU resources on the target system.
The vulnerability exists in the crypt(3) function, which accepts passwords longer that 1024 characters in auth_password() function in the auth_passwd.c . A remote unauthenticated attacker can submit a very long string as a password and consume excessive CPU resources.
Successful exploitation of this vulnerability may result in denial of service.
MitigationInstall updates from vendor's website.
Juniper Junos OS: 12.3R10 - 17.2
CPE2.3https://kb.juniper.net/InfoCenter/index?page=content&id=JSA10940&cat=SIRT_1&actp=LIST
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, proof of concept for this vulnerability is available.
4) Use-after free
EUVDB-ID: #VU1482
Risk: Low
CVSSv4.0: 9.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:A/U:Clear]
CVE-ID: CVE-2015-6564
CWE-ID:
CWE-416 - Use After Free
Exploit availability: No
DescriptionThe vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use after free error within the mm_answer_pam_free_ctx() function in monitor.c in sshd daemon on non-OpenBSD platforms. A local unprivileged user can send an unexpected early MONITOR_REQ_PAM_FREE_CTX request and gain root privileges on the system.
MitigationInstall updates from vendor's website.
Juniper Junos OS: 12.3R10 - 17.2
CPE2.3https://kb.juniper.net/InfoCenter/index?page=content&id=JSA10940&cat=SIRT_1&actp=LIST
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
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.
5) Improper input validation
EUVDB-ID: #VU2015
Risk: Low
CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Clear]
CVE-ID: CVE-2016-10009
CWE-ID:
CWE-20 - Improper input validation
Exploit availability: Yes
DescriptionThe vulnerability allows a remote attacker to execute arbitrary code on vulnerable ssh client.
The vulnerability exists due to incorrect handling of data passed to PKCS#11 module within ssh-agent. A remote attacker with control over sshd service can execute arbitrary code on vulnerable client.
Successful exploitation of this vulnerability may allow a remote attacker to execute arbitrary code on vulnerable client system but requires that client is connected to malicious SSH server.
Install updates from vendor's website.
Juniper Junos OS: 12.3R10 - 17.2
CPE2.3https://kb.juniper.net/InfoCenter/index?page=content&id=JSA10940&cat=SIRT_1&actp=LIST
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, proof of concept for this vulnerability is available.
6) Privilege escalation
EUVDB-ID: #VU2053
Risk: Low
CVSSv4.0: 7.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Clear]
CVE-ID: CVE-2016-10010
CWE-ID:
CWE-264 - Permissions, Privileges, and Access Controls
Exploit availability: Yes
DescriptionThe vulnerability allows a local user to execute arbitrary code on vulnerable system with root privileges.
The vulnerability exists due to an error in sshd in serverloop.c, which may allow a local authenticated user to execute arbitrary code with root privileges via a forwarded Unix-domain socket.
Successful exploitation of this vulnerability may allow a local user to elevate privileges.
Install updates from vendor's website.
Juniper Junos OS: 12.3R10 - 17.2
CPE2.3https://kb.juniper.net/InfoCenter/index?page=content&id=JSA10940&cat=SIRT_1&actp=LIST
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.
7) Information disclosure
EUVDB-ID: #VU2068
Risk: Low
CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2016-10011
CWE-ID:
CWE-264 - Permissions, Privileges, and Access Controls
Exploit availability: No
DescriptionThe vulnerability allows a local user to gain access to potentially sensitive information.
The vulnerability exists due to an error in authfile.c, which may allow a local authenticated user to obtain host private key material.
Successful exploitation of this vulnerability may allow a local user to gain access to otherwise restricted information.
Install updates from vendor's website.
Juniper Junos OS: 12.3R10 - 17.2
CPE2.3https://kb.juniper.net/InfoCenter/index?page=content&id=JSA10940&cat=SIRT_1&actp=LIST
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
8) Buffer overflow
EUVDB-ID: #VU2075
Risk: Low
CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2016-10012
CWE-ID:
CWE-119 - Memory corruption
Exploit availability: No
DescriptionThe vulnerability allows a local user to execute arbitrary code on vulnerable system with root privileges.
The vulnerability exists in sshd due to a flaw in boundary checks in the shared memory manager that may be skipped by some optimizing compilers. A local user can trigger memory corruption and execute arbitrary code with root privileges. The issue is related to m_zback and m_zlib data structures.
Successful exploitation of this vulnerability may allow a local user to elevate privileges.
Install updates from vendor's website.
Juniper Junos OS: 12.3R10 - 17.2
CPE2.3https://kb.juniper.net/InfoCenter/index?page=content&id=JSA10940&cat=SIRT_1&actp=LIST
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
