CVE-2022-49762
ntfs: check overflow when iterating ATTR_RECORDs
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Description
In the Linux kernel, the following vulnerability has been resolved: ntfs: check overflow when iterating ATTR_RECORDs Kernel iterates over ATTR_RECORDs in mft record in ntfs_attr_find(). Because the ATTR_RECORDs are next to each other, kernel can get the next ATTR_RECORD from end address of current ATTR_RECORD, through current ATTR_RECORD length field. The problem is that during iteration, when kernel calculates the end address of current ATTR_RECORD, kernel may trigger an integer overflow bug in executing `a = (ATTR_RECORD*)((u8*)a + le32_to_cpu(a->length))`. This may wrap, leading to a forever iteration on 32bit systems. This patch solves it by adding some checks on calculating end address of current ATTR_RECORD during iteration.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
- https://git.kernel.org/stable/c/45683723f6b53e39e8a4cec0894e61fd6ec71989
- https://git.kernel.org/stable/c/5559eb5809353a83a40a1e4e7f066431c7b83020
- https://git.kernel.org/stable/c/63095f4f3af59322bea984a6ae44337439348fe0
- https://git.kernel.org/stable/c/785b2af9654b8beac55644e36da0085c5d776361
- https://git.kernel.org/stable/c/86f36de14dce5802856bb7a5921d74439db00b64
References (8)
CVSS
- Attack Vector
- LOCAL
- Complexity
- LOW
- Privileges
- LOW
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- NONE
- Integrity
- NONE
- Availability
- HIGH
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