CVE-2015-5296
MEDIUMCVSS 5.4/10EPSS 7.29%
Last modified
CVE-2015-5296 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. Samba 3.x and 4.x before 4.1.22, 4.2.x before 4.2.7, and 4.3.x before 4.3.3 supports connections that are encrypted but unsigned, which allows man-in-the-middle attackers to conduct encrypted-to-unencrypted downgrade attacks by modifying the client-server data stream, related to clidfs.c, libsmb_server.c, and smbXcli_base.c.. EPSS estimates a 7.29% chance of exploitation in the next 30 days.
Description
Samba 3.x and 4.x before 4.1.22, 4.2.x before 4.2.7, and 4.3.x before 4.3.3 supports connections that are encrypted but unsigned, which allows man-in-the-middle attackers to conduct encrypted-to-unencrypted downgrade attacks by modifying the client-server data stream, related to clidfs.c, libsmb_server.c, and smbXcli_base.c.
Metrics
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Samba | Samba | >= 3.2.0, < 4.1.22 |
| Samba | Samba | >= 4.2.0, < 4.2.7 |
| Samba | Samba | >= 4.3.0, < 4.3.3 |
| Debian | Debian Linux | 7.0 |
| Debian | Debian Linux | 8.0 |
| Canonical | Ubuntu Linux | 12.04 |
| Canonical | Ubuntu Linux | 14.04 |
| Canonical | Ubuntu Linux | 15.04 |
| Canonical | Ubuntu Linux | 15.10 |
References
- http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174076.htmlMailing List, Third Party Advisory
- http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174391.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00019.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00020.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00032.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00033.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00002.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00017.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00042.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00047.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00048.htmlMailing List, Third Party Advisory
- http://www.debian.org/security/2016/dsa-3433Third Party Advisory
- http://www.oracle.com/technetwork/topics/security/bulletinjan2016-2867206.htmlThird Party Advisory
- http://www.securityfocus.com/bid/79732Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1034493Third Party Advisory, VDB Entry
- http://www.ubuntu.com/usn/USN-2855-1Third Party Advisory
- http://www.ubuntu.com/usn/USN-2855-2Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1290292Issue Tracking, Third Party Advisory
- https://security.gentoo.org/glsa/201612-47Third Party Advisory
- https://www.samba.org/samba/security/CVE-2015-5296.htmlVendor Advisory
- http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174076.htmlMailing List, Third Party Advisory
- http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174391.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00019.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00020.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00032.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00033.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00002.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00017.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00042.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00047.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00048.htmlMailing List, Third Party Advisory
- http://www.debian.org/security/2016/dsa-3433Third Party Advisory
- http://www.oracle.com/technetwork/topics/security/bulletinjan2016-2867206.htmlThird Party Advisory
- http://www.securityfocus.com/bid/79732Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1034493Third Party Advisory, VDB Entry
- http://www.ubuntu.com/usn/USN-2855-1Third Party Advisory
- http://www.ubuntu.com/usn/USN-2855-2Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1290292Issue Tracking, Third Party Advisory
- https://security.gentoo.org/glsa/201612-47Third Party Advisory
- https://www.samba.org/samba/security/CVE-2015-5296.htmlVendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2015-5296?
Samba 3.x and 4.x before 4.1.22, 4.2.x before 4.2.7, and 4.3.x before 4.3.3 supports connections that are encrypted but unsigned, which allows man-in-the-middle attackers to conduct encrypted-to-unencrypted downgrade attacks by modifying the client-server data stream, related to clidfs.c, libsmb_server.c, and smbXcli_base.c.
How severe is CVE-2015-5296?
CVE-2015-5296 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 7.29% probability of exploitation in the next 30 days.
How do I fix CVE-2015-5296?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
Are you affected by CVE-2015-5296?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST