Vulnerability · Published Mar 30, 2023 · Assigned by hackerone
CVE-2023-27533
Critical 9.8
In plain English
A critical-severity security flaw in https://github.com/curl/curl. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 2.2% (higher than 82% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
A vulnerability in input validation exists in curl <8.0 during communication using the TELNET protocol may allow an attacker to pass on maliciously crafted user name and "telnet options" during server negotiation. The lack of proper input scrubbing allows an attacker to send content or perform option negotiation without the application's intent. This vulnerability could be exploited if an application allows user input, thereby enabling attackers to execute arbitrary code on the system.
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-2023-27533 |
| Alpine:v3.21 | curl | 8.0.0-r0 | ALPINE-CVE-2023-27533 |
| Alpine:v3.22 | curl | 8.0.0-r0 | ALPINE-CVE-2023-27533 |
| Alpine:v3.23 | curl | 8.0.0-r0 | ALPINE-CVE-2023-27533 |
| Alpine:v3.24 | curl | 8.0.0-r0 | ALPINE-CVE-2023-27533 |
| Debian:12 | curl | 7.88.1-7 | DEBIAN-CVE-2023-27533 |
| Debian:13 | curl | 7.88.1-7 | DEBIAN-CVE-2023-27533 |
| Debian:14 | curl | 7.88.1-7 | DEBIAN-CVE-2023-27533 |
| Ubuntu:22.04:LTS | curl | 7.81.0-1ubuntu1.10 | UBUNTU-CVE-2023-27533 |
| 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-75 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- https://hackerone.com/reports/1891474
- FEDORA-2023-7e7414e64d vendor-advisory
- https://security.netapp.com/advisory/ntap-20230420-0011/
- [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-943925.html