6.7 CVE-2023-21400

Exploit
 

In multiple functions of io_uring.c, there is a possible kernel memory corruption due to improper locking. This could lead to local escalation of privilege in the kernel with System execution privileges needed. User interaction is not needed for exploitation.
https://nvd.nist.gov/vuln/detail/CVE-2023-21400

Categories

CWE-667 : Improper Locking
The product does not properly acquire or release a lock on a resource, leading to unexpected resource state changes and behaviors. Automated static analysis, commonly referred to as Static Application Security Testing (SAST), can find some instances of this weakness by analyzing source code (or binary/compiled code) without having to execute it. Typically, this is done by building a model of data flow and control flow, then searching for potentially-vulnerable patterns that connect "sources" (origins of input) with "sinks" (destinations where the data interacts with external components, a lower layer such as the OS, etc.) Use industry standard APIs to implement locking mechanism. Chain: improper locking (CWE-667) leads to race condition (CWE-362), as exploited in the wild per CISA KEV. Attacker provides invalid address to a memory-reading function, causing a mutex to be unlocked twice function in OS kernel unlocks a mutex that was not previously locked, causing a panic or overwrite of arbitrary memory. Chain: OS kernel does not properly handle a failure of a function call (CWE-755), leading to an unlock of a resource that was not locked (CWE-832), with resultant crash. OS kernel performs an unlock in some incorrect circumstances, leading to panic. OS deadlock OS deadlock involving 3 separate functions deadlock in library deadlock triggered by packets that force collisions in a routing table read/write deadlock between web server and script web server deadlock involving multiple listening connections multiple simultaneous calls to the same function trigger deadlock. chain: other weakness leads to NULL pointer dereference (CWE-476) or deadlock (CWE-833). deadlock when an operation is performed on a resource while it is being removed. Deadlock in device driver triggered by using file handle of a related device. Deadlock when large number of small messages cannot be processed quickly enough. OS kernel has deadlock triggered by a signal during a core dump. Race condition leads to deadlock. Chain: array index error (CWE-129) leads to deadlock (CWE-833) Program can not execute when attacker obtains a mutex. Program can not execute when attacker obtains a lock on a critical output file. Program can not execute when attacker obtains a lock on a critical output file. Critical file can be opened with exclusive read access by user, preventing application of security policy. Possibly related to improper permissions, large-window race condition. Chain: predictable file names used for locking, allowing attacker to create the lock beforehand. Resultant from permissions and randomness. Chain: Lock files with predictable names. Resultant from randomness. Product does not check if it can write to a log file, allowing attackers to avoid logging by accessing the file using an exclusive lock. Overlaps unchecked error condition. This is not quite CWE-412, but close.

References


 

CPE

cpe start end
Configuration 1
cpe:2.3:o:google:android:-:*:*:*:*:*:*:*
Configuration 2
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*


REMEDIATION




EXPLOITS


Exploit-db.com

id description date
No known exploits

POC Github

Url
No known exploits

Other Nist (github, ...)

Url
http://www.openwall.com/lists/oss-security/2023/07/19/2
http://www.openwall.com/lists/oss-security/2023/07/19/2


CAPEC


Common Attack Pattern Enumerations and Classifications

id description severity
25 Forced Deadlock
High
26 Leveraging Race Conditions
High
27 Leveraging Race Conditions via Symbolic Links
High


MITRE


Techniques

id description
T1499.004 Endpoint Denial of Service: Application or System Exploitation
© 2022 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation.

Mitigations

id description
M1037 Leverage services provided by Content Delivery Networks (CDN) or providers specializing in DoS mitigations to filter traffic upstream from services. Filter boundary traffic by blocking source addresses sourcing the attack, blocking ports that are being targeted, or blocking protocols being used for transport.
© 2022 The MITRE Corporation. Esta obra se reproduce y distribuye con el permiso de The MITRE Corporation.