Improper input validation in Haxx Libcurl
CVE-2021-22924
libcurl keeps previously used connections in a connection pool for subsequenttransfers to reuse, if one of them matches the setup.Due to errors in the logic, the config matching function did not take 'issuercert' into account and it compared the involved paths *case insensitively*,which could lead to libcurl reusing wrong connections.File paths are, or can be, case sensitive on many systems but not all, and caneven vary depending on used file systems.The comparison also didn't include the 'issuer cert' which a transfer can setto qualify how to verify the server certificate.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
EPSS: 0.063 (92.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N.
Affected products
- Haxx Libcurl
- Netapp Cloud_backup
- Netapp Clustered_data_ontap
- Netapp Solidfire_baseboard_management_controller_firmware
- Netapp Solidfire_\&_hci_management_node
- Oracle Mysql_server
- Oracle Peoplesoft_enterprise_peopletools — versions 8.57, 8.58, 8.59
- Siemens Logo\!_cmr2020
- Siemens Logo\!_cmr2020_firmware
- Siemens Logo\!_cmr2040
Weakness classification (CWE)
Public proof-of-concept exploits
References
- support@hackerone.com (Exploit, Patch, Third Party Advisory, x_refsource_MISC, Issue Tracking)
- support@hackerone.com (x_refsource_FEDORA, vendor-advisory, Mailing List, Third Party Advisory)
- support@hackerone.com (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
- support@hackerone.com (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
- support@hackerone.com (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
- support@hackerone.com (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
- support@hackerone.com (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
- support@hackerone.com (Patch, Third Party Advisory, x_refsource_MISC)
- support@hackerone.com (x_refsource_CONFIRM, Third Party Advisory)
- support@hackerone.com (Patch, Third Party Advisory, x_refsource_MISC)
Frequently asked questions
- What is CVE-2021-22924?
- CVE-2021-22924 is a low-severity vulnerability in Haxx Libcurl, classified under Improper Input Validation. CVSS score: 3.7/10. Published 2021-08-05.
- How severe is CVE-2021-22924?
- Low severity. CVSS v3 base score is 3.7 out of 10.
- Is CVE-2021-22924 known to be exploited?
- 7 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.