rhsa-2023:3408
Vulnerability from csaf_redhat
Published
2023-05-31 18:42
Modified
2025-10-22 20:48
Summary
Red Hat Security Advisory: openssl security update
Notes
Topic
An update for openssl is now available for Red Hat Enterprise Linux 8.6 Extended Update Support.
Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details
OpenSSL is a toolkit that implements the Secure Sockets Layer (SSL) and Transport Layer Security (TLS) protocols, as well as a full-strength general-purpose cryptography library.
Security Fix(es):
* openssl: timing attack in RSA Decryption implementation (CVE-2022-4304)
* openssl: double free after calling PEM_read_bio_ex (CVE-2022-4450)
* openssl: use-after-free following BIO_new_NDEF (CVE-2023-0215)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
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"discovery_date": "2023-01-25T00:00:00+00:00",
"ids": [
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"text": "2164487"
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{
"category": "description",
"text": "A timing-based side channel exists in the OpenSSL RSA Decryption implementation, which could be sufficient to recover a ciphertext across a network in a Bleichenbacher style attack. To achieve a successful decryption, an attacker would have to be able to send a very large number of trial messages for decryption. This issue affects all RSA padding modes: PKCS#1 v1.5, RSA-OEAP, and RSASVE.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "openssl: timing attack in RSA Decryption implementation",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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{
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{
"category": "description",
"text": "A double-free vulnerability was found in OpenSSL\u0027s PEM_read_bio_ex function. The function PEM_read_bio_ex() reads a PEM file from a BIO and parses and decodes the \"name\" (for example, \"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. Constructing a PEM file that results in 0 bytes of payload data is possible. In this case, PEM_read_bio_ex() will return a failure code but will populate the header argument with a pointer to a freed buffer. A double-free will occur if the caller also frees this buffer. This will most likely lead to a crash. This could be exploited by an attacker who can supply malicious PEM files for parsing to achieve a denial of service attack.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "openssl: double free after calling PEM_read_bio_ex",
"title": "Vulnerability summary"
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{
"category": "other",
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"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
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"title": "openssl: double free after calling PEM_read_bio_ex"
},
{
"cve": "CVE-2023-0215",
"cwe": {
"id": "CWE-416",
"name": "Use After Free"
},
"discovery_date": "2023-01-25T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2164492"
}
],
"notes": [
{
"category": "description",
"text": "A use-after-free vulnerability was found in OpenSSL\u0027s BIO_new_NDEF function. The public API function BIO_new_NDEF is a helper function used for streaming ASN.1 data via a BIO. It is primarily used internally by OpenSSL to support the SMIME, CMS, and PKCS7 streaming capabilities, but it may also be called directly by end-user applications. The function receives a BIO from the caller, prepends a new BIO_f_asn1 filter BIO onto the front of it to form a BIO chain, and then returns the new head of the BIO chain to the caller. Under certain conditions. For example, if a CMS recipient public key is invalid, the new filter BIO is freed, and the function returns a NULL result indicating a failure. However, in this case, the BIO chain is not properly cleaned up, and the BIO passed by the caller still retains internal pointers to the previously freed filter BIO. If the caller then calls BIO_pop() on the BIO, a use-after-free will occur, possibly resulting in a crash.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "openssl: use-after-free following BIO_new_NDEF",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This flaw was found in the OpenSSL library within the BIO_new_NDEF function, which is used for ASN.1 data streaming. The flaw is a use-after-free issue that happens when an error occurs while setting up a BIO chain. In this case, the filter BIO is freed, but the original BIO still holds a reference to it. If the caller later calls BIO_pop(), it tries to use this freed pointer, causing a crash and leading to a Denial of Service (DoS). The flaw is rated as moderate because it results in a crash but does not allow code execution, memory corruption beyond the crash, or data leakage.\n\nWithin regulated environments, a combination of the following controls acts as a significant barrier to successfully exploiting a CWE-416: Use After Free vulnerability and therefore downgrades the severity of this particular CVE from Moderate to Low.\n\nAccess to the platform is granted only after successful hard token-based multi-factor authentication (MFA) and is governed by least privilege to ensure that only authorized users and roles can execute or modify code. Red Hat also enforces least functionality, enabling only essential features, services, and ports. Hardening guidelines ensure the most restrictive settings required for operations, while baseline configurations enforce safe memory allocation and deallocation practices to reduce the risk of use-after-free vulnerabilities. The environment employs IPS/IDS and antimalware solutions to detect and prevent malicious code and provide real-time visibility into memory usage, lowering the risk of arbitrary code execution. Static code analysis and peer reviews enforce strong input validation and error handling, reducing the likelihood of denial-of-service (DoS) attacks. In the event of successful exploitation, process isolation prevents a compromised process from accessing memory freed by another, containing potential impact. Finally, memory protection mechanisms such as Data Execution Prevention (DEP) and Address Space Layout Randomization (ASLR) enhance resilience against memory-related vulnerabilities.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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},
{
"category": "external",
"summary": "RHBZ#2164492",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2164492"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2023-0215",
"url": "https://www.cve.org/CVERecord?id=CVE-2023-0215"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2023-0215",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-0215"
},
{
"category": "external",
"summary": "https://www.openssl.org/news/secadv/20230207.txt",
"url": "https://www.openssl.org/news/secadv/20230207.txt"
}
],
"release_date": "2023-02-07T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2023-05-31T18:42:35+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nFor the update to take effect, all services linked to the OpenSSL library must be restarted, or the system rebooted.",
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}
],
"title": "openssl: use-after-free following BIO_new_NDEF"
}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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