Buffer overflow in Moonlight-Stream Moonlight
CVE-2023-42801
Moonlight-common-c contains the core GameStream client code shared between Moonlight clients. Moonlight-common-c is vulnerable to buffer overflow starting in commit f57bd745b4cbed577ea654fad4701bea4d38b44c. A malicious game streaming server could exploit a buffer overflow vulnerability to crash a moonlight client. Achieving RCE is possible but unlikely, due to stack canaries in use by modern compiler toolchains. The published binaries for official clients Qt, Android, iOS/tvOS, and Embedded are built with stack canaries, but some unofficial clients may not use stack canaries. This vulnerability takes place after the pairing process, so it requires the client to be tricked into pairing to a malicious host. It is not possible to perform using a man-in-the-middle due to public key pinning that takes place during the pairing process. The bug was addressed in commit b2497a3918a6d79808d9fd0c04734786e70d5954.
Vulnerability class: Buffer Overflow
EPSS: 0.008 (52.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H.
Affected products
- Moonlight-stream Moonlight
- Moonlight-stream Moonlight-common-c — versions >= f57bd745b4cbed577ea654fad4701bea4d38b44c, < b2497a3918a6d79808d9fd0c04734786e70d5954
- Moonlight-stream Moonlight_embedded
- Moonlight-stream Moonlight_qt\/pc
- Moonlight-stream Moonlight_switch
- Moonlight-stream Moonlight_tv
- Moonlight-stream Moonlight_vita
- Moonlight-stream Moonlight_xbox
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Third Party Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Exploit, x_refsource_MISC)
Frequently asked questions
- What is CVE-2023-42801?
- CVE-2023-42801 is a high-severity vulnerability in Moonlight-Stream Moonlight, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.6/10. Published 2023-12-14.
- How severe is CVE-2023-42801?
- High severity. CVSS v3 base score is 7.6 out of 10.
- Is CVE-2023-42801 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.