Root code execution via sesman size underflow
Published Feb 7, 2022 · Updated Apr 23, 2025
Integer underflow in xrdp 0.9.17 through 0.9.18 allows unauthenticated attackers to execute root code via locally accessible sesman. The sesman_data_in parser accepts a message size below the eight-byte header, subtracts that size during processing, and allows an integer underflow to drive a heap overflow. Reachability requires local access to the sesman service, which listens on localhost by default but can be exposed remotely by configuration; successful exploitation compromises the host as root.
Summary
What happened
Integer underflow in xrdp 0.9.17 through 0.9.18 allows unauthenticated attackers to execute root code via locally accessible sesman. The sesman_data_in parser accepts a message size below the eight-byte header, subtracts that size during processing, and allows an integer underflow to drive a heap overflow. Reachability requires local access to the sesman service, which listens on localhost by default but can be exposed remotely by configuration; successful exploitation compromises the host as root.
The record
- CVE
- CVE-2022-23613
- Published
- Feb 7, 2022
- Updated
- Apr 23, 2025
- Vendor
- neutrinolabs
- Product
- xrdp
- Classifications
- CWE-839, CWE-191, CWE-130, T1203
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 7, 2022CVE publishedPublication date reported by the CVE source.
- Apr 23, 2025Record 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=>= 0.9.17, < 0.9.18.1
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
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Technologies
Your stack
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Your stack
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