Strix
26.1K

CVE-2021-22901

HIGHCVSS 8.1/10EPSS 60.12%

Last modified

CVE-2021-22901 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. curl 7.75.0 through 7.76.1 suffers from a use-after-free vulnerability resulting in already freed memory being used when a TLS 1.3 session ticket arrives over a connection. A malicious server can use this in rare unfortunate circumstances to potentially reach remote code execution in the client. EPSS estimates a 60.12% chance of exploitation in the next 30 days.

Description

curl 7.75.0 through 7.76.1 suffers from a use-after-free vulnerability resulting in already freed memory being used when a TLS 1.3 session ticket arrives over a connection. A malicious server can use this in rare unfortunate circumstances to potentially reach remote code execution in the client. When libcurl at run-time sets up support for TLS 1.3 session tickets on a connection using OpenSSL, it stores pointers to the transfer in-memory object for later retrieval when a session ticket arrives. If the connection is used by multiple transfers (like with a reused HTTP/1.1 connection or multiplexed HTTP/2 connection) that first transfer object might be freed before the new session is established on that connection and then the function will access a memory buffer that might be freed. When using that memory, libcurl might even call a function pointer in the object, making it possible for a remote code execution if the server could somehow manage to get crafted memory content into the correct place in memory.

Metrics

CVSS 3.1
8.1/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
60.12%

99.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
HaxxCurl>= 7.75.0, <= 7.76.1
OracleCommunications Cloud Native Core Binding Support Function1.11.0
OracleCommunications Cloud Native Core Network Function Cloud Native Environment1.10.0
OracleCommunications Cloud Native Core Network Repository Function1.15.0
OracleCommunications Cloud Native Core Network Repository Function1.15.1
OracleCommunications Cloud Native Core Network Slice Selection Function1.8.0
OracleCommunications Cloud Native Core Service Communication Proxy1.15.0
OracleEssbase< 11.1.2.4.047
OracleEssbase>= 21.0, < 21.3
OracleMysql Server<= 5.7.34
OracleMysql Server>= 8.0.0, <= 8.0.25
NetappActive Iq Unified ManagerAll versions
NetappCloud BackupAll versions
NetappOncommand InsightAll versions
NetappOncommand Workflow AutomationAll versions
NetappSnapcenterAll versions
NetappSolidfire\, Enterprise Sds \& Hci Storage NodeAll versions
NetappSolidfire \& Hci Management NodeAll versions
NetappSolidfire Baseboard Management Controller FirmwareAll versions
NetappHci Compute Node FirmwareAll versions
NetappH300e FirmwareAll versions
NetappH300s FirmwareAll versions
NetappH410s FirmwareAll versions
NetappH500e FirmwareAll versions
NetappH500s FirmwareAll versions
NetappH700e FirmwareAll versions
NetappH700s FirmwareAll versions
SiemensSinec Infrastructure Network Services< 1.0.1.1
SplunkUniversal Forwarder>= 8.2.0, < 8.2.12
SplunkUniversal Forwarder>= 9.0.0, < 9.0.6
SplunkUniversal Forwarder9.1.0

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-22901?
curl 7.75.0 through 7.76.1 suffers from a use-after-free vulnerability resulting in already freed memory being used when a TLS 1.3 session ticket arrives over a connection. A malicious server can use this in rare unfortunate circumstances to potentially reach remote code execution in the client. When libcurl at run-time sets up support for TLS 1.3 session tickets on a connection using OpenSSL, it stores pointers to the transfer in-memory object for later retrieval when a session ticket arrives. If the connection is used by multiple transfers (like with a reused HTTP/1.1 connection or multiplexed HTTP/2 connection) that first transfer object might be freed before the new session is established on that connection and then the function will access a memory buffer that might be freed. When using that memory, libcurl might even call a function pointer in the object, making it possible for a remote code execution if the server could somehow manage to get crafted memory content into the correct place in memory.
How severe is CVE-2021-22901?
CVE-2021-22901 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 60.12% probability of exploitation in the next 30 days.
How do I fix CVE-2021-22901?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-22901?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST