CVE-2022-43552

A use after free vulnerability exists in curl <7.87.0. Curl can be asked to tunnel virtually all protocols it supports through an HTTP proxy. HTTP proxies can (and often do) deny such tunnel operations. When getting denied to tunnel the specific protocols SMB or TELNET, curl would use a heap-allocated struct after it had been freed, in its transfer shutdown code path.

Weakness

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.

Affected Software

Name	Vendor	Start Version	End Version
Curl	Haxx	*	7.87.0 (excluding)
JBCS httpd 2.4.51.sp2	RedHat	jbcs-httpd24-curl	*
JBoss Core Services for RHEL 8	RedHat	jbcs-httpd24-curl-0:8.0.1-1.el8jbcs	*
JBoss Core Services on RHEL 7	RedHat	jbcs-httpd24-curl-0:8.0.1-1.el7jbcs	*
Red Hat Enterprise Linux 7	RedHat	curl-0:7.29.0-59.el7_9.2	*
Red Hat Enterprise Linux 8	RedHat	curl-0:7.61.1-30.el8	*
Red Hat Enterprise Linux 8.6 Extended Update Support	RedHat	curl-0:7.61.1-22.el8_6.12	*
Red Hat Enterprise Linux 9	RedHat	curl-0:7.76.1-23.el9	*
Red Hat Enterprise Linux 9	RedHat	curl-0:7.76.1-23.el9	*
Curl	Ubuntu	bionic	*
Curl	Ubuntu	devel	*
Curl	Ubuntu	esm-infra-legacy/trusty	*
Curl	Ubuntu	esm-infra/bionic	*
Curl	Ubuntu	esm-infra/focal	*
Curl	Ubuntu	esm-infra/xenial	*
Curl	Ubuntu	focal	*
Curl	Ubuntu	jammy	*
Curl	Ubuntu	kinetic	*
Curl	Ubuntu	lunar	*
Curl	Ubuntu	trusty	*
Curl	Ubuntu	trusty/esm	*
Curl	Ubuntu	upstream	*
Curl	Ubuntu	xenial	*

NVD	https://nvd.nist.gov/vuln/detail/CVE-2022-43552
CWE	https://cwe.mitre.org/data/definitions/416.html

Use After Free

Weakness

Affected Software

Potential Mitigations

References