CWE-757
Selection of Less-Secure Algorithm During Negotiation
2009-03-10
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特定のCWEの通知
特定のCWEの変更情報をいち早くお届けします。
名前: Selection of Less-Secure Algorithm During Negotiation
A protocol or its implementation supports interaction between multiple actors and allows those actors to negotiate which algorithm should be used in a protection mechanism such as encryption or authentication, but it does not select the strongest algorithm that is available to both parties.
一般情報
導入モード
Architecture and Design : COMMISSION: This weakness refers to an incorrect design related to an architectural security tactic.適用可能なプラットフォーム
言語
クラス： Not Language-Specific (Undetermined)一般的な結果
| スコープ | 影響 | 可能性 |
|---|---|---|
| Access Control | Bypass Protection Mechanism 注記：When a security mechanism can be forced to downgrade to use a less secure algorithm, this can make it easier for attackers to compromise the product by exploiting the weaker algorithm. The victim might not be aware that the less secure algorithm is being used. For example, if an attacker can force a communications channel to use cleartext instead of strongly-encrypted data, then the attacker could read the channel by sniffing, instead of going through extra effort of trying to decrypt the data using brute force techniques. |
観察された例
| 参考文献 | 説明 |
|---|---|
CVE-2006-4302 | Attacker can select an older version of the software to exploit its vulnerabilities. |
CVE-2006-4407 | Improper prioritization of encryption ciphers during negotiation leads to use of a weaker cipher. |
CVE-2005-2969 | Chain: SSL/TLS implementation disables a verification step (CWE-325) that enables a downgrade attack to a weaker protocol. |
CVE-2001-1444 | Telnet protocol implementation allows downgrade to weaker authentication and encryption using an Adversary-in-the-Middle AITM attack. |
CVE-2002-1646 | SSH server implementation allows override of configuration setting to use weaker authentication schemes. This may be a composite with CWE-642. |
検出方法
Automated Static Analysis
Automated static analysis, commonly referred to as Static Application Security Testing (SAST), can find some instances of this weakness by analyzing source code (or binary/compiled code) without having to execute it. Typically, this is done by building a model of data flow and control flow, then searching for potentially-vulnerable patterns that connect "sources" (origins of input) with "sinks" (destinations where the data interacts with external components, a lower layer such as the OS, etc.)有効性 : High
脆弱性マッピングノート
理由 : This CWE entry is at the Base level of abstraction, which is a preferred level of abstraction for mapping to the root causes of vulnerabilities.コメント : Carefully read both the name and description to ensure that this mapping is an appropriate fit. Do not try to 'force' a mapping to a lower-level Base/Variant simply to comply with this preferred level of abstraction.
関連する攻撃パターン
| CAPEC ID | 攻撃パターン名 |
|---|---|
| CAPEC-220 | Client-Server Protocol Manipulation
An adversary takes advantage of weaknesses in the protocol by which a client and server are communicating to perform unexpected actions. Communication protocols are necessary to transfer messages between client and server applications. Moreover, different protocols may be used for different types of interactions. |
| CAPEC-606 | Weakening of Cellular Encryption
An attacker, with control of a Cellular Rogue Base Station or through cooperation with a Malicious Mobile Network Operator can force the mobile device (e.g., the retransmission device) to use no encryption (A5/0 mode) or to use easily breakable encryption (A5/1 or A5/2 mode). |
| CAPEC-620 | Drop Encryption Level
An attacker forces the encryption level to be lowered, thus enabling a successful attack against the encrypted data. |
ノート
This is related to CWE-300, although not all downgrade attacks necessarily require an entity that redirects or interferes with the network. See examples.登録情報
| 名前 | 組織 | 日付 | リリース日 | Version |
|---|---|---|---|---|
| CWE Content Team | MITRE | 1.3 |
変更履歴
| 名前 | 組織 | 日付 | コメント |
|---|---|---|---|
| CWE Content Team | MITRE | updated Related_Attack_Patterns | |
| CWE Content Team | MITRE | updated Common_Consequences | |
| CWE Content Team | MITRE | updated Relationships | |
| CWE Content Team | MITRE | updated Relationships | |
| CWE Content Team | MITRE | updated Related_Attack_Patterns, Relationships | |
| CWE Content Team | MITRE | updated Modes_of_Introduction, Relationships | |
| CWE Content Team | MITRE | updated Type | |
| CWE Content Team | MITRE | updated Observed_Examples, Relationship_Notes, Relationships | |
| CWE Content Team | MITRE | updated Relationships | |
| CWE Content Team | MITRE | updated Observed_Examples | |
| CWE Content Team | MITRE | updated Relationships | |
| CWE Content Team | MITRE | updated Description | |
| CWE Content Team | MITRE | updated Detection_Factors, Relationships | |
| CWE Content Team | MITRE | updated Mapping_Notes | |
| CWE Content Team | MITRE | updated Applicable_Platforms, Relationships, Weakness_Ordinalities | |
| CWE Content Team | MITRE | updated Alternate_Terms, Common_Consequences, Description, Dimensions, Name, Type |
