CVE-2009-0949
説明
CVE.org より
The ippReadIO function in cups/ipp.c in cupsd in CUPS before 1.3.10 does not properly initialize memory for IPP request packets, which allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via a scheduler request with two consecutive IPP_TAG_UNSUPPORTED tags.
CVSS (Common Vulnerability Scoring System) のスコアの詳細
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 スコアの内訳
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| ベーススコア | 5 | 5 | N/A |
| 攻撃ベクトル | Network | Network | N/A |
| アクセスの複雑さ | Low | Low | N/A |
| 認証 | None | None | N/A |
| 機密性への影響 | None | None | N/A |
| 完全性への影響 | None | None | N/A |
| 可用性への影響 | Partial | Partial | N/A |
ベクトル
Red Hat: AV:N/AC:L/Au:N/C:N/I:N/A:P
NVD: AV:N/AC:L/Au:N/C:N/I:N/A:P
脆弱性の原因 (CWE) の理解
Availability
Technical Impact: DoS: Crash, Exit, or Restart
NULL pointer dereferences usually result in the failure of the process unless exception handling (on some platforms) is available and implemented. Even when exception handling is being used, it can still be very difficult to return the software to a safe state of operation.
Integrity,Confidentiality
Technical Impact: Execute Unauthorized Code or Commands; Read Memory; Modify Memory
In rare circumstances, when NULL is equivalent to the 0x0 memory address and privileged code can access it, then writing or reading memory is possible, which may lead to code execution.
謝辞
Red Hat would like to thank Anibal Sacco (Core Security Technologies) for reporting this issue.
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