Vulnerability · Published Mar 30, 2023 · Assigned by hackerone
CVE-2023-27538
High 7.7
In plain English
A high-severity security flaw in https://github.com/curl/curl. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.5% (higher than 73% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
An authentication bypass vulnerability exists in libcurl prior to v8.0.0 where it reuses a previously established SSH connection despite the fact that an SSH option was modified, which should have prevented reuse. libcurl maintains a pool of previously used connections to reuse them for subsequent transfers if the configurations match. However, two SSH settings were omitted from the configuration check, allowing them to match easily, potentially leading to the reuse of an inappropriate connection.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:9 | curl | 7.76.1-26.el9 | ALSA-2023:6679 |
| AlmaLinux:9 | curl-minimal | 7.76.1-26.el9 | ALSA-2023:6679 |
| AlmaLinux:9 | libcurl | 7.76.1-26.el9 | ALSA-2023:6679 |
| AlmaLinux:9 | libcurl-devel | 7.76.1-26.el9 | ALSA-2023:6679 |
| AlmaLinux:9 | libcurl-minimal | 7.76.1-26.el9 | ALSA-2023:6679 |
| Alpine:v3.20 | curl | 8.0.0-r0 | ALPINE-CVE-2023-27538 |
| Alpine:v3.21 | curl | 8.0.0-r0 | ALPINE-CVE-2023-27538 |
| Alpine:v3.22 | curl | 8.0.0-r0 | ALPINE-CVE-2023-27538 |
| Alpine:v3.23 | curl | 8.0.0-r0 | ALPINE-CVE-2023-27538 |
| Alpine:v3.24 | curl | 8.0.0-r0 | ALPINE-CVE-2023-27538 |
| Debian:12 | curl | 7.88.1-7 | DEBIAN-CVE-2023-27538 |
| Debian:13 | curl | 7.88.1-7 | DEBIAN-CVE-2023-27538 |
| Debian:14 | curl | 7.88.1-7 | DEBIAN-CVE-2023-27538 |
| Ubuntu:22.04:LTS | curl | 7.81.0-1ubuntu1.10 | UBUNTU-CVE-2023-27538 |
| Ubuntu:22.04:LTS | curl | 7.81.0-1ubuntu1.10 | USN-5964-1 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| n/a | https://github.com/curl/curl | Fixed in 8.0.0 |
Weakness: CWE-305 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
References
- https://hackerone.com/reports/1898475
- https://security.netapp.com/advisory/ntap-20230420-0010/
- [debian-lts-announce] 20230421 [SECURITY] [DLA 3398-1] curl security update mailing-list
- GLSA-202310-12 vendor-advisory
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
- https://cert-portal.siemens.com/productcert/html/ssa-077170.html
- https://cert-portal.siemens.com/productcert/html/ssa-943925.html