Vulnerability in OpenBSD OpenSSH
CVE-2013-4548
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.
Published · last modified .
CVSS v2 metric
CVSS v2 base score 6.0 (Medium). Vector: AV:N/AC:M/Au:S/C:P/I:P/A:P. This CVE predates CVSS v3 and has no v3 score from NVD.
EPSS exploit prediction
EPSS: 0.027 (85.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 85th percentile — 85.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.027 · newest: 0.027 · change: 0.000
Affected products
- OpenBSD OpenSSH — versions 6.2, 6.3
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.openssh.com/txt/gcmrekey.adv (Vendor Advisory)
- openwall.com/lists/oss-security/2013/11/08/3 (mailing-list)
- marc.info/ (vendor-advisory)
- lists.opensuse.org/opensuse-security-announce/2013-11/msg00017.html (vendor-advisory)
- www.ubuntu.com/usn/USN-2014-1 (vendor-advisory)
Frequently asked questions
- What is CVE-2013-4548?
- CVE-2013-4548 is a vulnerability in OpenBSD OpenSSH, classified under CWE-264. Published 2013-11-08.
- Is CVE-2013-4548 known to be exploited?
- 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.