CVE-2013-4548

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.

Category

6.0
CVSS
Severity: Medium
CVSS 2.0 •
EPSS 0.29%
Vendor Advisory marc.info Vendor Advisory opensuse.org Vendor Advisory ubuntu.com Vendor Advisory openssh.com
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
http://www.openssh.com/txt/gcmrekey.adv vendor advisory
http://openwall.com/lists/oss-security/2013/11/08/3 mailing list
http://marc.info/?l=bugtraq&m=141576985122836&w=2 vendor advisory
http://lists.opensuse.org/opensuse-security-announce/2013-11/msg00017.html vendor advisory
http://www.ubuntu.com/usn/USN-2014-1 vendor advisory

Frequently Asked Questions

What is the severity of CVE-2013-4548?
CVE-2013-4548 has been scored as a medium severity vulnerability.
How to fix CVE-2013-4548?
To fix CVE-2013-4548, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2013-4548 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2013-4548 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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