Client memory read via unchecked orderType index
Published Jun 22, 2020 · Updated Aug 4, 2024
Out-of-bounds read in FreeRDP before 2.1.2 allows remote attackers controlling an RDP server to access adjacent client memory. In libfreerdp/core/orders.c, update_recv_primary_order uses an attacker-controlled orderType directly to index the 28-entry PRIMARY_DRAWING_ORDER_FIELD_BYTES array without validating that it is at most 27. Exploitation requires a client to process a primary drawing order from the attacker's RDP server; the demonstrated effect is an out-of-bounds read, not code execution.
Summary
What happened
Out-of-bounds read in FreeRDP before 2.1.2 allows remote attackers controlling an RDP server to access adjacent client memory. In libfreerdp/core/orders.c, update_recv_primary_order uses an attacker-controlled orderType directly to index the 28-entry PRIMARY_DRAWING_ORDER_FIELD_BYTES array without validating that it is at most 27. Exploitation requires a client to process a primary drawing order from the attacker's RDP server; the demonstrated effect is an out-of-bounds read, not code execution.
The record
- CVE
- CVE-2020-11095
- Published
- Jun 22, 2020
- Updated
- Aug 4, 2024
- Vendor
- FreeRDP
- Product
- FreeRDP
- Classifications
- CWE-125
- Attack vector
- network
- Privileges
- Unavailable
Timeline
How it unfolded
- Jun 22, 2020CVE publishedPublication date reported by the CVE source.
- Aug 4, 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?
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- Affected versionversion=< 2.1.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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