Consuming excessive CPU resources on the target system in openssh (Alpine package)
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2016-6515 |
| CWE-ID | CWE-400 |
| Exploitation vector | Network |
| Public exploit | Public exploit code for vulnerability #1 is available. |
| Vulnerable software Subscribe |
openssh (Alpine package) Operating systems & Components / Operating system package or component |
| Vendor | Alpine Linux Development Team |
Security Bulletin
This security bulletin contains one medium risk vulnerability.
1) Consuming excessive CPU resources on the target system
EUVDB-ID: #VU252
Risk: Medium
CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:P/RL:O/RC:C]
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 update from vendor's website.
Vulnerable software versionsopenssh (Alpine package): 6.7_p1-r5
External linkshttp://git.alpinelinux.org/aports/commit/?id=110afa7ead25761b7734c452b9667ac3b7202d91
http://git.alpinelinux.org/aports/commit/?id=595ce63a37806b62042c9223d1a311ebc36daa39
http://git.alpinelinux.org/aports/commit/?id=7b9cdd4e6e25a7f0e7177584ab65bfd44fd58139
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.
