Process-memory disclosure via unchecked SMB reply offset
Published Apr 20, 2023 · Updated Feb 5, 2025
Integer overflow in libsmb2 on Sonos One 70.3-35220 allows attackers to disclose process memory through a malicious SMB reply. In anacapad, smb2_process_query_directory_fixed() accepts an output-buffer offset without checking it against the PDU length, so decoding reads out of bounds and returns memory bytes as a filename. No authentication is required, but the speaker must access an attacker-controlled SMB share from the adjacent network; the disclosed libc and heap addresses support a separate code-execution flaw.
Summary
What happened
Integer overflow in libsmb2 on Sonos One 70.3-35220 allows attackers to disclose process memory through a malicious SMB reply. In anacapad, smb2_process_query_directory_fixed() accepts an output-buffer offset without checking it against the PDU length, so decoding reads out of bounds and returns memory bytes as a filename. No authentication is required, but the speaker must access an attacker-controlled SMB share from the adjacent network; the disclosed libc and heap addresses support a separate code-execution flaw.
The record
- CVE
- CVE-2023-27354
- Published
- Apr 20, 2023
- Updated
- Feb 5, 2025
- Vendor
- Sonos
- Product
- Sonos One
- Classifications
- CWE-190, T1210
- Attack vector
- adjacent
- Privileges
- unauthenticated
Timeline
How it unfolded
- Dec 9, 2022Exploitation reportedPwn2Own Toronto 2022 Sonos One exploit chain
- Apr 20, 2023CVE publishedPublication date reported by the CVE source.
- Feb 5, 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=70.3-35220
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
- Pwn2Own Toronto Sonos One exploit chainfunctional · demonstrated
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Reported exploitation
- Pwn2Own Toronto 2022 Sonos One exploit chainexploit chain
Technologies
Your stack
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Your stack
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