CVE-2016-5000
Description
De CVE.org
The XLSX2CSV example in Apache POI before 3.14 allows remote attackers to read arbitrary files via a crafted OpenXML document containing an external entity declaration in conjunction with an entity reference, related to an XML External Entity (XXE) issue.
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 | 7.5 | 5.5 | N/A |
| Vecteur d'attaque | Network | Local | N/A |
| Complexité de l'attaque | Low | Low | N/A |
| Privilèges requis | None | None | N/A |
| Interaction avec l'utilisateur | None | Required | N/A |
| Champ d'application | Unchanged | Unchanged | N/A |
| Confidentialité | High | High | N/A |
| Impact sur l'intégrité | None | None | N/A |
| Impact sur la disponibilité | None | None | N/A |
Vecteur
Red Hat: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Les mesures et les scores CVSS suivants sont préliminaires et sujets à révision.
Répartition des scores CVSS v2
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Score de base | 7.1 | 4.3 | N/A |
| Vecteur d'attaque | Network | Network | N/A |
| Complexité d'accès | Medium | Medium | N/A |
| Authentification | None | None | N/A |
| Impact sur la confidentialité | Complete | Partial | N/A |
| Impact sur l'intégrité | None | None | N/A |
| Impact sur la disponibilité | None | None | N/A |
Vecteur
Red Hat: AV:N/AC:M/Au:N/C:C/I:N/A:N
NVD: AV:N/AC:M/Au:N/C:P/I:N/A:N
Comprendre la Défaillance (CWE)
Confidentiality
Technical Impact: Read Application Data; Read Files or Directories
If the attacker is able to include a crafted DTD and a default entity resolver is enabled, the attacker may be able to access arbitrary files on the system. By submitting an XML file that defines an external entity with a file:// URI, an attacker can cause the processing application to read the contents of a local file. For example, a URI such as "file:///c:/winnt/win.ini" designates (in Windows) the file C:\Winnt\win.ini, or file:///etc/passwd designates the password file in Unix-based systems. Once the content of the URI is read, it is fed back into the application that is processing the XML. This application may echo back the data (e.g., in an error message), thereby exposing the file contents.
Integrity
Technical Impact: Bypass Protection Mechanism
An attacker may supply a crafted DTD using URIs with schemes such as http://, forcing the application to make outgoing HTTP requests to servers that the attacker cannot reach directly, which can be used to bypass firewall restrictions; hide the source of attacks such as port scanning; or otherwise leverage the server's trust relationship with other entities.
Availability
Technical Impact: DoS: Resource Consumption (CPU); DoS: Resource Consumption (Memory)
The product could consume excessive CPU cycles or memory using a URI that points to a large file, or a device that always returns data such as /dev/random. Alternately, the URI could reference a file that contains many nested or recursive entity references to further slow down parsing.
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