漏洞信息
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Vulnerability Title
python-cryptography: Duplicate self-signed intermediates can cause exponential path-building
Vulnerability Description
python-cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. In versions 42.0.0 through 48.0.0, when resolving invalid certificate chains that include duplicate copies of self-signed certificates, the processing recursively invokes the same candidate, leading to an exponential blowup. Although the limitation that the chain depth cannot exceed a specified maximum depth prevents unbounded recursion and guarantees termination, an attacker-controlled certificate chain can lead the processing to easily take more than 5s to reject in testing. This amplification could form the basis for a resource exhaustion denial of service attack. The core issue arises in the recursive nature of build_chain_inner, which does not de-duplicate against previously analyzed candidates. As the correctness of validation is not affected, the integrity of a system cannot be compromised through this vector, only its availability. This issue is fixed in 49.0.0.
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Vulnerability Title
pyca cryptography 资源管理错误漏洞
Vulnerability Description
Python Cryptographic Authority cryptography是Python Cryptographic Authority组织开源的一款密码学工具库。 pyca cryptography 49.0.0之前版本存在资源管理错误漏洞,该漏洞源于解析无效证书链时递归处理重复的自签名证书,未对已分析候选去重,导致计算量指数级增长,可能造成资源耗尽拒绝服务。
CVSS Information
N/A
Vulnerability Type
N/A