Use-after free in openssh (Alpine package)
| Risk | Low |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2015-6564 |
| CWE-ID | CWE-416 |
| Exploitation vector | Local |
| 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 low risk vulnerability.
1) Use-after free
EUVDB-ID: #VU1482
Risk: Low
CVSSv3.1: 8.2 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:F/RL:O/RC:C]
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 update from vendor's website.
Vulnerable software versionsopenssh (Alpine package): 6.4_p1-r3
External linkshttp://git.alpinelinux.org/aports/commit/?id=8a07923212fef85b959a7a5d33641b887bb28926
http://git.alpinelinux.org/aports/commit/?id=9f54596949dd38f889aab1798292ffe1c3bc7ed3
http://git.alpinelinux.org/aports/commit/?id=397b30fdd336abf6492edc4c261e51445808a133
http://git.alpinelinux.org/aports/commit/?id=d17bb4a5103becdf779de640c3274345395bb8b9
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.
