CyberSecBulletin
CVE-2022-1473NVD status: Modified

OpenSSL: Incomplete Cleanup

Published Updated By the CyberSecBulletin desk

CVE-2022-1473 is a high-severity incomplete cleanup vulnerability in OpenSSL, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected OpenSSL versions: Fixed in OpenSSL 3.0.3 (Affected 3.0.0,3.0.1,3.0.2). The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 4.68% chance of exploitation within 30 days, which is in the top 8.08% of all scored CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update SIMATIC S7-1500 CPU 1518-4 PN/DP MFP to V3.1.5 or a later version.
  2. Update SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP to V3.1.5 or a later version.
  3. Update SIMATIC S7-1500 TM MFP - GNU/Linux subsystem to V1.1 or a later version.
  4. Read the advisory on openssl.org for workarounds and exact fixed builds.
  5. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.

Affected products and versions

VendorProductAffected versionsFixed in
OpenSSLOpenSSLFixed in OpenSSL 3.0.3 (Affected 3.0.0,3.0.1,3.0.2)Not stated
SiemensSIMATIC S7-1500 CPU 1518-4 PN/DP MFPV3.1.0 up to, but not including, V3.1.5V3.1.5
SiemensSIMATIC S7-1500 CPU 1518F-4 PN/DP MFPV3.1.0 up to, but not including, V3.1.5V3.1.5
SiemensSIMATIC S7-1500 TM MFP - GNU/Linux subsystembefore V1.1V1.1
SiemensSINAMICS PERFECT HARMONY GH180all versionsNot stated
SiemensSIPLUS S7-1500 CPU 1518-4 PN/DP MFPV3.1.0 up to, but not including, V3.1.5V3.1.5
NetAppActive Iq Unified ManagerNot specified in the recordNot stated
NetAppClustered Data OntapNot specified in the recordNot stated
NetAppClustered Data Ontap Antivirus ConnectorNot specified in the recordNot stated
NetAppSantricity Smi-s ProviderNot specified in the recordNot stated
NetAppSmi-s ProviderNot specified in the recordNot stated
NetAppSnapmanagerNot specified in the recordNot stated
NetAppSolidfire, Enterprise Sds & Hci Storage NodeNot specified in the recordNot stated
NetAppSolidfire & Hci Management NodeNot specified in the recordNot stated
NetAppA700s FirmwareNot specified in the recordNot stated
NetAppH300s FirmwareNot specified in the recordNot stated
NetAppH500s FirmwareNot specified in the recordNot stated
NetAppH700s FirmwareNot specified in the recordNot stated
NetAppH300e FirmwareNot specified in the recordNot stated
NetAppH500e FirmwareNot specified in the recordNot stated
NetAppH700e FirmwareNot specified in the recordNot stated
NetAppH410s FirmwareNot specified in the recordNot stated
NetAppAff 8300 FirmwareNot specified in the recordNot stated
NetAppFas 8300 FirmwareNot specified in the recordNot stated
NetAppAff 8700 FirmwareNot specified in the recordNot stated

Version data comes from the organisation that assigned the CVE; 6 further products are omitted here. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
NoneNo data is disclosed.
Integrity
NoneNothing can be modified.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. Scored by NVD.

Scoring systemScoreSeverityScored by
CVSS 3.17.5HighNVD
CVSS 3.17.5HighCISA (ADP)
CVSS 2.05.0MediumNVD

Official description

The OPENSSL_LH_flush() function, which empties a hash table, contains a bug that breaks reuse of the memory occuppied by the removed hash table entries. This function is used when decoding certificates or keys. If a long lived process periodically decodes certificates or keys its memory usage will expand without bounds and the process might be terminated by the operating system causing a denial of service. Also traversing the empty hash table entries will take increasingly more time. Typically such long lived processes might be TLS clients or TLS servers configured to accept client certificate authentication. The function was added in the OpenSSL 3.0 version thus older releases are not affected by the issue. Fixed in OpenSSL 3.0.3 (Affected 3.0.0,3.0.1,3.0.2).

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Incomplete Cleanup

The product does not properly clean up and remove temporary or supporting resources after they have been used.

How developers prevent this class of flaw

  • Temporary files and other supporting resources should be deleted/released immediately after they are no longer needed.

More Incomplete Cleanup vulnerabilities (CWE-459)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Third-party and government advisories

Other vulnerabilities in OpenSSL

All OpenSSL vulnerabilities

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