CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
EPSS
Percentile
99.7%
All current released versions of Samba are vulnerable to a denial of
service on an authenticated or guest connection. A malformed packet
can cause the smbd server to loop the CPU performing memory
allocations and preventing any further service.
A connection to a file share, or a local account is needed to exploit
this problem, either authenticated or unauthenticated if guest
connections are allowed.
This flaw is not exploitable beyond causing the code to loop
allocating memory, which may cause the machine to exceed memory
limits.
A patch addressing this defect has been posted to
http://www.samba.org/samba/security/
Additionally, Samba 3.5.22, 3.6.17 and 4.0.8 have been issued as
security releases to correct the defect. Patches against older Samba
versions are available at http://samba.org/samba/patches/. Samba
vendors and administrators running affected versions are advised to
upgrade or apply the patch as soon as possible.
None.
This problem was found by an internal audit of the Samba code by
Jeremy Allison of Google.