Vulnerabilities > CVE-2019-19330 - Injection vulnerability in multiple products
Attack vector
NETWORK Attack complexity
LOW Privileges required
NONE Confidentiality impact
HIGH Integrity impact
HIGH Availability impact
HIGH Summary
The HTTP/2 implementation in HAProxy before 2.0.10 mishandles headers, as demonstrated by carriage return (CR, ASCII 0xd), line feed (LF, ASCII 0xa), and the zero character (NUL, ASCII 0x0), aka Intermediary Encapsulation Attacks.
Vulnerable Configurations
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Buffer Overflow via Environment Variables This attack pattern involves causing a buffer overflow through manipulation of environment variables. Once the attacker finds that they can modify an environment variable, they may try to overflow associated buffers. This attack leverages implicit trust often placed in environment variables.
- Server Side Include (SSI) Injection An attacker can use Server Side Include (SSI) Injection to send code to a web application that then gets executed by the web server. Doing so enables the attacker to achieve similar results to Cross Site Scripting, viz., arbitrary code execution and information disclosure, albeit on a more limited scale, since the SSI directives are nowhere near as powerful as a full-fledged scripting language. Nonetheless, the attacker can conveniently gain access to sensitive files, such as password files, and execute shell commands.
- Cross Site Scripting through Log Files An attacker may leverage a system weakness where logs are susceptible to log injection to insert scripts into the system's logs. If these logs are later viewed by an administrator through a thin administrative interface and the log data is not properly HTML encoded before being written to the page, the attackers' scripts stored in the log will be executed in the administrative interface with potentially serious consequences. This attack pattern is really a combination of two other attack patterns: log injection and stored cross site scripting.
- Command Line Execution through SQL Injection An attacker uses standard SQL injection methods to inject data into the command line for execution. This could be done directly through misuse of directives such as MSSQL_xp_cmdshell or indirectly through injection of data into the database that would be interpreted as shell commands. Sometime later, an unscrupulous backend application (or could be part of the functionality of the same application) fetches the injected data stored in the database and uses this data as command line arguments without performing proper validation. The malicious data escapes that data plane by spawning new commands to be executed on the host.
- Subverting Environment Variable Values The attacker directly or indirectly modifies environment variables used by or controlling the target software. The attacker's goal is to cause the target software to deviate from its expected operation in a manner that benefits the attacker.
Nessus
NASL family Ubuntu Local Security Checks NASL id UBUNTU_USN-4212-1.NASL description Tim Dusterhus discovered that HAProxy incorrectly handled certain HTTP/2 headers. An attacker could possibly use this issue to execute arbitrary code through CRLF injection. Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-01 modified 2020-06-02 plugin id 131722 published 2019-12-05 reporter Ubuntu Security Notice (C) 2019 Canonical, Inc. / NASL script (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/131722 title Ubuntu 18.04 LTS / 19.04 / 19.10 : haproxy vulnerability (USN-4212-1) NASL family Gentoo Local Security Checks NASL id GENTOO_GLSA-202004-01.NASL description The remote host is affected by the vulnerability described in GLSA-202004-01 (HAProxy: Remote execution of arbitrary code) It was discovered that HAProxy incorrectly handled certain HTTP/2 headers. Impact : A remote attacker could send a specially crafted HTTP/2 header, possibly resulting in execution of arbitrary code with the privileges of the process or a Denial of Service condition. Workaround : There is no known workaround at this time. last seen 2020-04-07 modified 2020-04-02 plugin id 135112 published 2020-04-02 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/135112 title GLSA-202004-01 : HAProxy: Remote execution of arbitrary code NASL family PhotonOS Local Security Checks NASL id PHOTONOS_PHSA-2020-3_0-0047_HAPROXY.NASL description An update of the haproxy package has been released. last seen 2020-06-01 modified 2020-06-02 plugin id 133064 published 2020-01-18 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/133064 title Photon OS 3.0: Haproxy PHSA-2020-3.0-0047 NASL family Debian Local Security Checks NASL id DEBIAN_DSA-4577.NASL description Tim Dusterhus discovered that haproxy, a TCP/HTTP reverse proxy, did not properly sanitize HTTP headers when converting from HTTP/2 to HTTP/1. This would allow a remote user to perform CRLF injections. last seen 2020-06-01 modified 2020-06-02 plugin id 131438 published 2019-12-03 reporter This script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/131438 title Debian DSA-4577-1 : haproxy - security update NASL family Red Hat Local Security Checks NASL id REDHAT-RHSA-2020-1936.NASL description The remote Redhat Enterprise Linux 7 / 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2020:1936 advisory. - haproxy: HTTP request smuggling issue with transfer- encoding header containing an obfuscated chunked value (CVE-2019-18277) - haproxy: HTTP/2 implementation vulnerable to intermediary encapsulation attacks (CVE-2019-19330) - haproxy: malformed HTTP/2 requests can lead to out-of- bounds writes (CVE-2020-11100) Note that Nessus has not tested for this issue but has instead relied only on the application last seen 2020-05-08 modified 2020-05-05 plugin id 136319 published 2020-05-05 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/136319 title RHEL 7 / 8 : OpenShift Container Platform 4.4.3 haproxy (RHSA-2020:1936) NASL family Red Hat Local Security Checks NASL id REDHAT-RHSA-2020-1725.NASL description The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2020:1725 advisory. - haproxy: HTTP request smuggling issue with transfer- encoding header containing an obfuscated chunked value (CVE-2019-18277) - haproxy: HTTP/2 implementation vulnerable to intermediary encapsulation attacks (CVE-2019-19330) Note that Nessus has not tested for this issue but has instead relied only on the application last seen 2020-04-30 modified 2020-04-28 plugin id 136052 published 2020-04-28 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/136052 title RHEL 8 : haproxy (RHSA-2020:1725) NASL family PhotonOS Local Security Checks NASL id PHOTONOS_PHSA-2019-1_0-0263_HAPROXY.NASL description An update of the haproxy package has been released. last seen 2020-06-01 modified 2020-06-02 plugin id 132965 published 2020-01-16 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/132965 title Photon OS 1.0: Haproxy PHSA-2019-1.0-0263
Redhat
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References
- https://tools.ietf.org/html/rfc7540#section-10.3
- https://www.debian.org/security/2019/dsa-4577
- https://seclists.org/bugtraq/2019/Nov/45
- https://usn.ubuntu.com/4212-1/
- https://security.gentoo.org/glsa/202004-01
- https://git.haproxy.org/?p=haproxy.git%3Ba=commit%3Bh=54f53ef7ce4102be596130b44c768d1818570344
- https://git.haproxy.org/?p=haproxy.git%3Ba=commit%3Bh=146f53ae7e97dbfe496d0445c2802dd0a30b0878
- https://git.haproxy.org/?p=haproxy-2.0.git%3Ba=commit%3Bh=ac198b92d461515551b95daae20954b3053ce87e