CWE-757
Selection of Less-Secure Algorithm During Negotiation
2009-03-10
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指定 CWE 通知
随时了解指定 CWE 的变更。
名称: 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.
基本信息
引入方式
Architecture and Design : COMMISSION: This weakness refers to an incorrect design related to an architectural security tactic.适用平台
编程语言
类： Not Language-Specific (Undetermined)常见后果
| 影响范围 | 影响 | 可能性 |
|---|---|---|
| Access Control | Bypass Protection Mechanism 注意： 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. |
观察示例
| 参考资料 | 描述 |
|---|---|
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. |
检测方法
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.)有效性 : High
漏洞映射说明
依据 : 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.备注 : 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.
相关攻击模式
| CAPEC ID | 攻击模式名称 |
|---|---|
| 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. |
备注
This is related to CWE-300, although not all downgrade attacks necessarily require an entity that redirects or interferes with the network. See examples.提交记录
| 名称 | 组织 | 日期 | 发布日期 | Version |
|---|---|---|---|---|
| CWE Content Team | MITRE | 1.3 |
修改记录
| 名称 | 组织 | 日期 | 备注 |
|---|---|---|---|
| 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 |
