Bugzilla – Bug 1198723
VUL-1: CVE-2022-27775: curl: Bad local IPv6 connection reuse
Last modified: 2022-09-20 11:41:18 UTC
Bad local IPv6 connection reuse
Project curl Security Advisory, April 27 2022 -
libcurl keeps previously used connections in a connection pool for subsequent
transfers to reuse, if one of them matches the setup.
Due to errors in the logic, the config matching function did not take the IPv6
address zone id into account which could lead to libcurl reusing the wrong
connection when one transfer uses a zone id and a subsequent transfer uses
another (or no) zone id.
We are not aware of any exploit of this flaw.
Zone ids are only used for non-global scoped IPv6 addresses and they are only
used when specifying the address numerically.
This flaw has existed in curl since commit [2d0e9b40d3237b1](https://github.com/curl/curl/commit/2d0e9b40d3237b1), shipped in libcurl 7.65.0, released on May 22 2019. Previous versions will
instead not accept URLs with zone ids.
The Common Vulnerabilities and Exposures (CVE) project has assigned the name
CVE-2022-27775 to this issue.
CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
- Affected versions: curl 7.65.0 to and including 7.82.0
- Not affected versions: curl < 7.65.0 and curl >= 7.83.0
Also note that libcurl is used by many applications, and not always advertised
A [fix for CVE-2022-27775](https://github.com/curl/curl/commit/058f98dc3fe595f21dc26)
A - Upgrade curl to version 7.83.0
B - Apply the patch to your local version
C - Do not use non-global numerical IPv6 addresses in URLs to curl
This issue was reported to the curl project on April 21, 2022. We contacted
distros@openwall on April 21.
libcurl 7.83.0 was released on April 27 2022, coordinated with the publication
of this advisory.
This issue was reported by Harry Sintonen. Patched by Daniel Stenberg.
Thanks a lot!
SUSE-SU-2022:1657-1: An update that fixes three vulnerabilities is now available.
Category: security (moderate)
Bug References: 1198614,1198723,1198766
CVE References: CVE-2022-22576,CVE-2022-27775,CVE-2022-27776
openSUSE Leap 15.3 (src): curl-7.66.0-150184.108.40.206
SUSE Linux Enterprise Module for Basesystem 15-SP3 (src): curl-7.66.0-150220.127.116.11
SUSE Linux Enterprise Micro 5.2 (src): curl-7.66.0-15018.104.22.168
SUSE Linux Enterprise Micro 5.1 (src): curl-7.66.0-15022.214.171.124
NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.