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CVE-2021-23840— Integer overflow in CipherUpdate

EPSS 0.53% · P67
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I. Basic Information for CVE-2021-23840

Vulnerability Information
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Vulnerability Title
Integer overflow in CipherUpdate
Source: NVD (National Vulnerability Database)
Vulnerability Description
Calls to EVP_CipherUpdate, EVP_EncryptUpdate and EVP_DecryptUpdate may overflow the output length argument in some cases where the input length is close to the maximum permissable length for an integer on the platform. In such cases the return value from the function call will be 1 (indicating success), but the output length value will be negative. This could cause applications to behave incorrectly or crash. OpenSSL versions 1.1.1i and below are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1j. OpenSSL versions 1.0.2x and below are affected by this issue. However OpenSSL 1.0.2 is out of support and no longer receiving public updates. Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should upgrade to 1.1.1j. Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i). Fixed in OpenSSL 1.0.2y (Affected 1.0.2-1.0.2x).
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
OpenSSL 输入验证错误漏洞
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 存在输入验证错误漏洞，攻击者可利用该漏洞导致应用程序行为不正确或崩溃。
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

VendorProductAffected VersionsCPESubscribe
OpenSSLOpenSSL Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i) -

II. Public POCs for CVE-2021-23840

#POC DescriptionSource LinkShenlong Link
1Nonehttps://github.com/Trinadh465/openssl-1.1.1g_CVE-2021-23840POC Details
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III. Intelligence Information for CVE-2021-23840

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Same Patch Batch · OpenSSL · 2021-02-16 · 3 CVEs total

CVE-2021-23841Null pointer deref in X509_issuer_and_serial_hash()
CVE-2021-23839Incorrect SSLv2 rollback protection

IV. Related Vulnerabilities

Same product: OpenSSL
Same vendor: OpenSSL

V. Comments for CVE-2021-23840

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