Out-of-bounds Read in Stefanberger Swtpm
CVE-2022-23645
swtpm is a libtpms-based TPM emulator with socket, character device, and Linux CUSE interface. Versions prior to 0.5.3, 0.6.2, and 0.7.1 are vulnerable to out-of-bounds read. A specially crafted header of swtpm's state, where the blobheader's hdrsize indicator has an invalid value, may cause an out-of-bounds access when the byte array representing the state of the TPM is accessed. This will likely crash swtpm or prevent it from starting since the state cannot be understood. Users should upgrade to swtpm v0.5.3, v0.6.2, or v0.7.1 to receive a patch. There are currently no known workarounds.
Vulnerability class: Buffer Overflow
EPSS: 0.004 (33.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.2 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Stefanberger Swtpm — versions < 0.5.3, >= 0.6.0, < 0.6.2, = 0.7.0
- Swtpm_project Swtpm — versions 0.7.0
- Fedoraproject Fedora — versions 35
- Redhat Enterprise_linux — versions 8.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM, Patch, Third Party Advisory)
- security-advisories@github.com (Patch, Third Party Advisory, x_refsource_MISC)
- security-advisories@github.com (Third Party Advisory, x_refsource_MISC, Release Notes)
- security-advisories@github.com (Third Party Advisory, x_refsource_MISC, Release Notes)
- security-advisories@github.com (Third Party Advisory, x_refsource_MISC, Release Notes)
- security-advisories@github.com (x_refsource_FEDORA, vendor-advisory)
Frequently asked questions
- What is CVE-2022-23645?
- CVE-2022-23645 is a medium-severity vulnerability in Stefanberger Swtpm, classified under Out-of-bounds Read. CVSS score: 6.2/10. Published 2022-02-18.
- How severe is CVE-2022-23645?
- Medium severity. CVSS v3 base score is 6.2 out of 10.
- Is CVE-2022-23645 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.