CVE-2023-6237 Affecting openssl-libs package, versions <1:3.0.7-27.el9
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Test your applications- Snyk ID SNYK-ALMALINUX9-OPENSSLLIBS-6827902
- published 9 May 2024
- disclosed 12 Nov 2024
Introduced: 9 May 2024
CVE-2023-6237 Open this link in a new tabHow to fix?
Upgrade AlmaLinux:9 openssl-libs to version 1:3.0.7-27.el9 or higher.
This issue was patched in ALSA-2024:2447.
NVD Description
Note: Versions mentioned in the description apply only to the upstream openssl-libs package and not the openssl-libs package as distributed by AlmaLinux.
See How to fix? for AlmaLinux:9 relevant fixed versions and status.
Issue summary: Checking excessively long invalid RSA public keys may take a long time.
Impact summary: Applications that use the function EVP_PKEY_public_check() to check RSA public keys may experience long delays. Where the key that is being checked has been obtained from an untrusted source this may lead to a Denial of Service.
When function EVP_PKEY_public_check() is called on RSA public keys, a computation is done to confirm that the RSA modulus, n, is composite. For valid RSA keys, n is a product of two or more large primes and this computation completes quickly. However, if n is an overly large prime, then this computation would take a long time.
An application that calls EVP_PKEY_public_check() and supplies an RSA key obtained from an untrusted source could be vulnerable to a Denial of Service attack.
The function EVP_PKEY_public_check() is not called from other OpenSSL functions however it is called from the OpenSSL pkey command line application. For that reason that application is also vulnerable if used with the '-pubin' and '-check' options on untrusted data.
The OpenSSL SSL/TLS implementation is not affected by this issue.
The OpenSSL 3.0 and 3.1 FIPS providers are affected by this issue.
References
- https://errata.almalinux.org/9/ALSA-2024-2447.html
- https://errata.almalinux.org/9/ALSA-2024-9088.html
- https://access.redhat.com/security/cve/CVE-2023-6237
- https://access.redhat.com/errata/RHSA-2024:2447
- https://access.redhat.com/errata/RHSA-2024:9088
- http://www.openwall.com/lists/oss-security/2024/03/11/1
- https://github.com/openssl/openssl/commit/0b0f7abfb37350794a4b8960fafc292cd5d1b84d
- https://github.com/openssl/openssl/commit/18c02492138d1eb8b6548cb26e7b625fb2414a2a
- https://github.com/openssl/openssl/commit/a830f551557d3d66a84bbb18a5b889c640c36294
- https://security.netapp.com/advisory/ntap-20240531-0007/
- https://www.openssl.org/news/secadv/20240115.txt