In the Linux kernel, the following vulnerability has been resolved:
ceph: reject export_targets ranks >= CEPH_MAX_MDS in mdsmap decode
MDSMap export_targets entries are monitor controlled. check_new_map()
uses each entry as a bit number in a fixed stack bitmap, so a rank
outside the protocol namespace can make set_bit() write past the end of
the array.
Reject ranks outside CEPH_MAX_MDS while decoding the map. Do not
validate against possible_max_rank here because maps may legitimately
reference ranks beyond a temporarily reduced max_mds.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
References 7
https://git.kernel.org/stable/c/4d298880f82c42383b36946bafde7ccf4d804c9b
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/736adee11af36e407ed902264f8b2fb5cf94b62f
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/96c3f5fbb0d5386e7111426f047f98cec4586674
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/aedc9053d909508a5f56c3f49f885fc030df4730
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/3740c88ca9cb2210a8dbdd55ea4cec119fbe86fe
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/8c823bbab3c24e657469a84db96902ba82d4e8bb
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/c4addccd05bacbef2144b4db14853d0308a218ac
416baaa9-dc9f-4396-8d5f-8c081fb06d67