OpenSSL Multiple Denial of Service Vulnerabilities

Multiple vulnerabilities have been reported in OpenSSL, which can be exploited by malicious people to cause a DoS (Denial of Service).

1

An error related to the "X509_issuer_and_serial_hash()" function (crypto/x509/x509_cmp.c) can be exploited to trigger a NULL pointer dereference and subsequently cause a crash.

2

An integer overflow error related to CipherUpdate calls can be exploited to cause a crash.

The vulnerabilities are reported in versions prior to 1.1.1j and prior to 1.0.2y.

Affected Software

The following software is affected by the described vulnerability. Please check the vendor links below to see if exactly your version is affected.

OpenSSL 1.x

Solution

Update to version 1.1.1j or 1.0.2y.

References

1. https://www.openssl.org/news/secadv/20210216.txt <https://www.openssl.org/news/secadv/20210216.txt>
2. https://github.com/openssl/openssl/commit/8130d654d1de922ea224fa18ee3bc7262edc39c0 <https://github.com/openssl/openssl/commit/8130d654d1de922ea224fa18ee3bc7262edc39c0>
3. https://github.com/openssl/openssl/commit/c9fb704cf3af5524eb8e79961e31b60eee8c3c47 <https://github.com/openssl/openssl/commit/c9fb704cf3af5524eb8e79961e31b60eee8c3c47>

Please provide an update.