// For flags

CVE-2023-52444

f2fs: fix to avoid dirent corruption

Severity Score

7.8
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track
*SSVC
Descriptions

In the Linux kernel, the following vulnerability has been resolved:

f2fs: fix to avoid dirent corruption

As Al reported in link[1]:

f2fs_rename()
...
if (old_dir != new_dir && !whiteout)
f2fs_set_link(old_inode, old_dir_entry,
old_dir_page, new_dir);
else
f2fs_put_page(old_dir_page, 0);

You want correct inumber in the ".." link. And cross-directory
rename does move the source to new parent, even if you'd been asked
to leave a whiteout in the old place.

[1] https://lore.kernel.org/all/20231017055040.GN800259@ZenIV/

With below testcase, it may cause dirent corruption, due to it missed
to call f2fs_set_link() to update ".." link to new directory.
- mkdir -p dir/foo
- renameat2 -w dir/foo bar

[ASSERT] (__chk_dots_dentries:1421) --> Bad inode number[0x4] for '..', parent parent ino is [0x3]
[FSCK] other corrupted bugs [Fail]

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: f2fs: corrección para evitar corrupción directa Como informó Al en link[1]: f2fs_rename() ... if (old_dir != new_dir && !whiteout) f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir); demás f2fs_put_page(old_dir_page, 0); Quiere el número correcto en el enlace ".." Y el cambio de nombre entre directorios mueve la fuente al nuevo padre, incluso si le hubieran pedido que dejara un espacio en blanco en el lugar anterior. [1] https://lore.kernel.org/all/20231017055040.GN800259@ZenIV/ Con el siguiente caso de prueba, puede causar corrupción directa, debido a que no llamó a f2fs_set_link() para actualizar el enlace ".." al nuevo directorio . - mkdir -p dir/foo - renameat2 -w dir/foo bar [ASSERT] (__chk_dots_dentries:1421) --> Número de inodo incorrecto [0x4] para '..', el ino padre padre es [0x3] [FSCK] otro corrupto errores [falla]

*Credits: N/A
CVSS Scores
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
* Common Vulnerability Scoring System
SSVC
  • Decision:Track
Exploitation
None
Automatable
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2024-02-20 CVE Reserved
  • 2024-02-22 CVE Published
  • 2024-03-15 EPSS Updated
  • 2024-12-19 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 4.2 < 4.19.306
Search vendor "Linux" for product "Linux Kernel" and version " >= 4.2 < 4.19.306"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 4.2 < 5.4.268
Search vendor "Linux" for product "Linux Kernel" and version " >= 4.2 < 5.4.268"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 4.2 < 5.10.209
Search vendor "Linux" for product "Linux Kernel" and version " >= 4.2 < 5.10.209"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 4.2 < 5.15.148
Search vendor "Linux" for product "Linux Kernel" and version " >= 4.2 < 5.15.148"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 4.2 < 6.1.75
Search vendor "Linux" for product "Linux Kernel" and version " >= 4.2 < 6.1.75"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 4.2 < 6.6.14
Search vendor "Linux" for product "Linux Kernel" and version " >= 4.2 < 6.6.14"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 4.2 < 6.7.2
Search vendor "Linux" for product "Linux Kernel" and version " >= 4.2 < 6.7.2"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 4.2 < 6.8
Search vendor "Linux" for product "Linux Kernel" and version " >= 4.2 < 6.8"
en
Affected