CVE-2023-0836
haproxy: data leak via fcgi requests
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
An information leak vulnerability was discovered in HAProxy 2.1, 2.2 before 2.2.27, 2.3, 2.4 before 2.4.21, 2.5 before 2.5.11, 2.6 before 2.6.8, 2.7 before 2.7.1. There are 5 bytes left uninitialized in the connection buffer when encoding the FCGI_BEGIN_REQUEST record. Sensitive data may be disclosed to configured FastCGI backends in an unexpected way.
A flaw was found in HAProxy, which could allow a remote attacker to obtain sensitive information caused by improper initialization when encoding the FCGI_BEGIN_REQUEST record. By sending a specially crafted request, an attacker could exploit this vulnerability to obtain sensitive information and use this information to launch further attacks against the affected system.
It was reported that HAProxy, a fast and reliable load balancing reverse proxy, does not properly initialize connection buffers when encoding the FCGI_BEGIN_REQUEST record. A remote attacker can take advantage of this flaw to cause an information leak.
CVSS Scores
SSVC
- Decision:Attend
Timeline
- 2023-02-14 CVE Reserved
- 2023-03-29 CVE Published
- 2025-02-18 CVE Updated
- 2025-03-30 EPSS Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
- CWE-459: Incomplete Cleanup
CAPEC
References (4)
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|---|---|
| https://www.debian.org/security/2023/dsa-5388 | 2023-11-07 | |
| https://access.redhat.com/security/cve/CVE-2023-0836 | 2023-11-07 | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2180746 | 2023-11-07 |
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Haproxy Search vendor "Haproxy" | Haproxy Search vendor "Haproxy" for product "Haproxy" | >= 2.2.0 < 2.2.27 Search vendor "Haproxy" for product "Haproxy" and version " >= 2.2.0 < 2.2.27" | - |
Affected
| ||||||
| Haproxy Search vendor "Haproxy" | Haproxy Search vendor "Haproxy" for product "Haproxy" | >= 2.4.0 <= 2.4.21 Search vendor "Haproxy" for product "Haproxy" and version " >= 2.4.0 <= 2.4.21" | - |
Affected
| ||||||
| Haproxy Search vendor "Haproxy" | Haproxy Search vendor "Haproxy" for product "Haproxy" | >= 2.5.0 <= 2.5.11 Search vendor "Haproxy" for product "Haproxy" and version " >= 2.5.0 <= 2.5.11" | - |
Affected
| ||||||
| Haproxy Search vendor "Haproxy" | Haproxy Search vendor "Haproxy" for product "Haproxy" | >= 2.6.0 <= 2.6.8 Search vendor "Haproxy" for product "Haproxy" and version " >= 2.6.0 <= 2.6.8" | - |
Affected
| ||||||
| Haproxy Search vendor "Haproxy" | Haproxy Search vendor "Haproxy" for product "Haproxy" | 2.1.0 Search vendor "Haproxy" for product "Haproxy" and version "2.1.0" | - |
Affected
| ||||||
| Haproxy Search vendor "Haproxy" | Haproxy Search vendor "Haproxy" for product "Haproxy" | 2.3.0 Search vendor "Haproxy" for product "Haproxy" and version "2.3.0" | - |
Affected
| ||||||
| Haproxy Search vendor "Haproxy" | Haproxy Search vendor "Haproxy" for product "Haproxy" | 2.7.0 Search vendor "Haproxy" for product "Haproxy" and version "2.7.0" | - |
Affected
| ||||||