CVE-2020-13362
Description
An out-of bounds read-access flaw was found in the MegaRAID SAS 8708EM2 emulator of the QEMU. This flaw occurs in the' megasas_lookup_frame' routine when the 's->reply_queue_head' is set to a malicious value. A guest user or process may use this flaw to crash the QEMU process on the host resulting in a denial of service.
Détails du score du système commun d'évaluation des vulnérabilités (CVSS)
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
Les mesures et les scores CVSS suivants sont préliminaires et sujets à révision.
Répartition des scores CVSS v3
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Score de base | 3.2 | 3.2 | N/A |
| Vecteur d'attaque | Local | Local | N/A |
| Complexité de l'attaque | Low | Low | N/A |
| Privilèges requis | High | High | N/A |
| Interaction avec l'utilisateur | None | None | N/A |
| Champ d'application | Changed | Changed | N/A |
| Confidentialité | None | None | N/A |
| Impact sur l'intégrité | None | None | N/A |
| Impact sur la disponibilité | Low | Low | N/A |
Vecteur
Red Hat: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:L
NVD: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:L
Comprendre la Défaillance (CWE)
Confidentiality
Technical Impact: Read Memory
An attacker could get secret values such as cryptographic keys, PII, memory addresses, or other information that could be used in additional attacks.
Confidentiality
Technical Impact: Bypass Protection Mechanism
Out-of-bounds memory could contain memory addresses or other information that can be used to bypass ASLR and other protection mechanisms in order to improve the reliability of exploiting a separate weakness for code execution.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
An attacker could cause a segmentation fault or crash by causing memory to be read outside of the bounds of the buffer. This is especially likely when the code reads a variable amount of data and assumes that a sentinel exists to stop the read operation, such as a NUL in a string.
Other
Technical Impact: Varies by Context
The read operation could produce other undefined or unexpected results.
Remerciements
Red Hat would like to thank Alexander Bulekov, Hanqing Zhao (SSLab Georgia Tech), and Ren Ding (SSLab Georgia Tech) for reporting this issue.
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