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CVE-2022-4450— Double free after calling PEM_read_bio_ex

Quick assessment

Affected
OpenSSL OpenSSL
Exploitation
High exploitation probability; assess promptly
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 存在安全漏洞，该漏洞源于在PEM_read_bio_ex函数中存在双重释放漏洞，攻击者利用该漏洞可以提供恶意PEM文件进行解析以实现拒绝服务攻击。

AI Predicted 5.5 Difficulty: Easy EPSS 20.44% · P97

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2022-4450

Vulnerability Information
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Vulnerability Title
Double free after calling PEM_read_bio_ex
Source: CVE Program / CVE List V5
Vulnerability Description
The function PEM_read_bio_ex() reads a PEM file from a BIO and parses and decodes the "name" (e.g. "CERTIFICATE"), any header data and the payload data. If the function succeeds then the "name_out", "header" and "data" arguments are populated with pointers to buffers containing the relevant decoded data. The caller is responsible for freeing those buffers. It is possible to construct a PEM file that results in 0 bytes of payload data. In this case PEM_read_bio_ex() will return a failure code but will populate the header argument with a pointer to a buffer that has already been freed. If the caller also frees this buffer then a double free will occur. This will most likely lead to a crash. This could be exploited by an attacker who has the ability to supply malicious PEM files for parsing to achieve a denial of service attack. The functions PEM_read_bio() and PEM_read() are simple wrappers around PEM_read_bio_ex() and therefore these functions are also directly affected. These functions are also called indirectly by a number of other OpenSSL functions including PEM_X509_INFO_read_bio_ex() and SSL_CTX_use_serverinfo_file() which are also vulnerable. Some OpenSSL internal uses of these functions are not vulnerable because the caller does not free the header argument if PEM_read_bio_ex() returns a failure code. These locations include the PEM_read_bio_TYPE() functions as well as the decoders introduced in OpenSSL 3.0. The OpenSSL asn1parse command line application is also impacted by this issue.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
OpenSSL 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
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 存在安全漏洞，该漏洞源于在PEM_read_bio_ex函数中存在双重释放漏洞，攻击者利用该漏洞可以提供恶意PEM文件进行解析以实现拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
OpenSSL OpenSSL 3.0.0 ~ 3.0.8 -

II. Public POCs for CVE-2022-4450

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III. Intelligence Information for CVE-2022-4450

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Vendor Advisories for CVE-2022-4450 (1)

Other References for CVE-2022-4450 (2)

Same Patch Batch · OpenSSL · 2023-02-08 · 7 CVEs total

CVE-2022-4304 Timing Oracle in RSA Decryption
CVE-2023-0215 Use-after-free following BIO_new_NDEF
CVE-2023-0216 Invalid pointer dereference in d2i_PKCS7 functions
CVE-2023-0217 NULL dereference validating DSA public key
CVE-2023-0286 X.400 address type confusion in X.509 GeneralName
CVE-2023-0401 NULL dereference during PKCS7 data verification

IV. Related Vulnerabilities

Same product: OpenSSL
Same vendor: OpenSSL

V. Comments for CVE-2022-4450

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