Disk exhaustion via multipart length integer wraparound
Published May 20, 2020 · Updated Sep 16, 2024
Integer overflow in PHP 7.2.x before 7.2.31, 7.3.x before 7.3.18, and 7.4.x before 7.4.6 allows remote attackers to fill disk via multipart uploads. In main/rfc1867.c, signed length counters wrap for oversized field values, while an int cast truncates an oversized array-style upload field name; both become huge allocation sizes. HTTP uploads and multi-gigabyte size limits are required, and allocation failure stops cleanup, leaving earlier upload temporary files to accumulate until storage is exhausted.
Summary
What happened
Integer overflow in PHP 7.2.x before 7.2.31, 7.3.x before 7.3.18, and 7.4.x before 7.4.6 allows remote attackers to fill disk via multipart uploads. In main/rfc1867.c, signed length counters wrap for oversized field values, while an int cast truncates an oversized array-style upload field name; both become huge allocation sizes. HTTP uploads and multi-gigabyte size limits are required, and allocation failure stops cleanup, leaving earlier upload temporary files to accumulate until storage is exhausted.
The record
- CVE
- CVE-2019-11048
- Published
- May 20, 2020
- Updated
- Sep 16, 2024
- Vendor
- The PHP Group
- Product
- PHP
- Classifications
- CWE-190, CWE-400, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 20, 2020CVE publishedPublication date reported by the CVE source.
- Sep 16, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=7.2.x <7.2.31
- Affected versionversion=7.3.x <7.3.18
- Affected versionversion=7.4.x <7.4.6
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Oversized multipart upload field-name proof of conceptproof of concept · demonstrated
- Oversized multipart array-name proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
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