Vulnerability Description
The mm_newkeys_from_blob function in monitor_wrap.c in sshd in OpenSSH 6.2 and 6.3, when an AES-GCM cipher is used, does not properly initialize memory for a MAC context data structure, which allows remote authenticated users to bypass intended ForceCommand and login-shell restrictions via packet data that provides a crafted callback address.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Openbsd | Openssh | 6.2 |
Related Weaknesses (CWE)
References
- http://lists.opensuse.org/opensuse-security-announce/2013-11/msg00017.html
- http://marc.info/?l=bugtraq&m=141576985122836&w=2
- http://openwall.com/lists/oss-security/2013/11/08/3
- http://www.openssh.com/txt/gcmrekey.advVendor Advisory
- http://www.ubuntu.com/usn/USN-2014-1
- http://lists.opensuse.org/opensuse-security-announce/2013-11/msg00017.html
- http://marc.info/?l=bugtraq&m=141576985122836&w=2
- http://openwall.com/lists/oss-security/2013/11/08/3
- http://www.openssh.com/txt/gcmrekey.advVendor Advisory
- http://www.ubuntu.com/usn/USN-2014-1
FAQ
What is CVE-2013-4548?
CVE-2013-4548 is a vulnerability with a CVSS score of 6.0 (MEDIUM). The mm_newkeys_from_blob function in monitor_wrap.c in sshd in OpenSSH 6.2 and 6.3, when an AES-GCM cipher is used, does not properly initialize memory for a MAC context data structure, which allows r...
How severe is CVE-2013-4548?
CVE-2013-4548 has been rated MEDIUM with a CVSS base score of 6.0/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2013-4548?
Check the references section above for vendor advisories and patch information. Affected products include: Openbsd Openssh.