Out-of-bounds Read in Samba
CVE-2019-14907
All samba versions 4.9.x before 4.9.18, 4.10.x before 4.10.12 and 4.11.x before 4.11.5 have an issue where if it is set with "log level = 3" (or above) then the string obtained from the client, after a failed character conversion, is printed. Such strings can be provided during the NTLMSSP authentication exchange. In the Samba AD DC in particular, this may cause a long-lived process(such as the RPC server) to terminate. (In the file server case, the most likely target, smbd, operates as process-per-client and so a crash there is harmless).
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.032 (87.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 88th percentile — 87.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.032 · newest: 0.032 · change: 0.000
Affected products
- Samba
- Synology Directory Server
- Synology Diskstation Manager — versions 6.2
- Synology Router Manager — versions 1.2
- Synology Skynas
- Canonical Ubuntu Linux — versions 16.04, 18.04, 19.04
- Debian Linux — versions 9.0
- Fedoraproject Fedora — versions 30, 31
- Red Hat Samba — versions All versions 4.11.x before 4.11.5, All versions 4.10.x before 4.10.12, All versions 4.9.x before 4.9.18
- Red Hat Enterprise Linux — versions 7.0, 8.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- www.samba.org/samba/security/CVE-2019-14907.html (Vendor Advisory)
- security.netapp.com/advisory/ntap-20200122-0001/ (Third Party Advisory)
- www.synology.com/security/advisory/Synology_SA_20_01 (Third Party Advisory)
- usn.ubuntu.com/4244-1/ (vendor-advisory, Third Party Advisory)
- lists.opensuse.org/opensuse-security-announce/2020-01/msg00055.html (vendor-advisory, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- security.gentoo.org/glsa/202003-52 (vendor-advisory, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2021/05/msg00023.html (mailing-list, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2019-14907?
- CVE-2019-14907 is a medium-severity vulnerability in Samba, classified under Out-of-bounds Read. CVSS score: 6.5/10. Published 2020-01-21.
- How severe is CVE-2019-14907?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2019-14907 known to be exploited?
- 6 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.