CVE-2013-6393
Description
A heap based buffer oveflow exists in the libyaml package such that a remote attacker could provide a specifically crafted YAML document when parsed by the application could result in remote code execution and complete compromise of the system.
Statement
The Red Hat security response team has rated this issue as having low security impact in Red Hat Enterpise MRG 1 and 2, CloudForms 3, and Red Hat Network Satellite 5. This issue is not currently planned to be addressed in future updates.Redhat satellite 6 does not ship libyaml
The Red Hat security response team has rated this issue as having low security impact in Red Hat Update Infrastructure. A future update may address this issue.
The Red Hat security response team has rated this issue as having moderate security impact in Subscription Asset Manager 1. A future update may address this issue.
For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/
Mitigation
Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Common Vulnerability Scoring System (CVSS) Score Details
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).
CVSS v2 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 4.3 | 6.8 | N/A |
| Attack Vector | Adjacent Network | Network | N/A |
| Access Complexity | High | Medium | N/A |
| Authentication | None | None | N/A |
| Confidentiality Impact | Partial | Partial | N/A |
| Integrity Impact | Partial | Partial | N/A |
| Availability Impact | Partial | Partial | N/A |
Vector
Red Hat: AV:A/AC:H/Au:N/C:P/I:P/A:P
NVD: AV:N/AC:M/Au:N/C:P/I:P/A:P
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Crash, Exit, or Restart; DoS: Resource Consumption (CPU); DoS: Resource Consumption (Memory)
Buffer overflows generally lead to crashes. Other attacks leading to lack of availability are possible, including putting the program into an infinite loop.
Integrity,Confidentiality,Availability,Access Control
Technical Impact: Execute Unauthorized Code or Commands; Bypass Protection Mechanism; Modify Memory
Buffer overflows often can be used to execute arbitrary code, which is usually outside the scope of a program's implicit security policy. Besides important user data, heap-based overflows can be used to overwrite function pointers that may be living in memory, pointing it to the attacker's code. Even in applications that do not explicitly use function pointers, the run-time will usually leave many in memory. For example, object methods in C++ are generally implemented using function pointers. Even in C programs, there is often a global offset table used by the underlying runtime.
Integrity,Confidentiality,Availability,Access Control,Other
Technical Impact: Execute Unauthorized Code or Commands; Bypass Protection Mechanism; Other
When the consequence is arbitrary code execution, this can often be used to subvert any other security service.
Acknowledgements
This issue was discovered by Florian Weimer (Red Hat Product Security Team).
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