漏洞信息
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Vulnerability Title
NULL Dereference in Certificate Verification with OCSP Checking
Vulnerability Description
Issue summary: When a partial-chain certificate verification is enabled
together with OCSP response checking for the whole chain, a NULL dereference
will happen if the verified chain does not have a self-signed trusted anchor,
crashing the process.
Impact summary: A NULL pointer dereference can trigger a crash which leads to a
Denial of Service for an application.
When performing OCSP response checking for certificates in the verification
chain, the code always tries to access the next certificate as the issuer.
There is a check for a self-signed certificate. However with the partial
chain verification enabled when the chain does not have a self-signed trusted
anchor, the issuer will be NULL for the last certificate in the chain. A NULL
pointer dereference then happens.
This issue affects only applications which enable both OCSP verification
of the certificate chain (X509_V_FLAG_OCSP_RESP_CHECK_ALL) and partial
chain verification (X509_V_FLAG_PARTIAL_CHAIN) in the certificate
verification. Both flags are disabled by default. For that reason, we have
assigned Low severity to the issue.
No FIPS modules are affected by this issue as the affected code is outside
the OpenSSL FIPS module boundary.
CVSS Information
N/A
Vulnerability Type
空指针解引用
Vulnerability Title
OpenSSL 代码问题漏洞
Vulnerability Description
OpenSSL是OpenSSL团队的一个开源的能够实现安全套接层(SSLv2/v3)和安全传输层(TLSv1)协议的通用加密库。该产品支持多种加密算法,包括对称密码、哈希算法、安全散列算法等。 OpenSSL存在代码问题漏洞,该漏洞源于部分链证书验证与OCSP响应检查结合时空指针取消引用,可能导致拒绝服务。以下版本受到影响:启用X509_V_FLAG_OCSP_RESP_CHECK_ALL和X509_V_FLAG_PARTIAL_CHAIN的版本。
CVSS Information
N/A
Vulnerability Type
N/A