CVE-2015-1782

libssh2: Using SSH_MSG_KEXINIT data unbounded

Severity Score

6.8

*CVSS v2

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

The kex_agree_methods function in libssh2 before 1.5.0 allows remote servers to cause a denial of service (crash) or have other unspecified impact via crafted length values in an SSH_MSG_KEXINIT packet.

La función kex_agree_methods en libssh2 anterior a 1.5.0 permite a servidores remotos causar una denegación de servicio (caída) o tener otro impacto sin especificar a través de valores de longitud modificados en un paquete SSH_MSG_KEXINIT.

A flaw was found in the way the kex_agree_methods() function of libssh2 performed a key exchange when negotiating a new SSH session. A man-in-the-middle attacker could use a crafted SSH_MSG_KEXINIT packet to crash a connecting libssh2 client.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2015-02-17 CVE Reserved
2015-03-11 CVE Published
2023-03-07 EPSS Updated
2024-08-06 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-20: Improper Input Validation
CWE-130: Improper Handling of Length Parameter Inconsistency

CAPEC

References (10)

URL	Tag	Source
http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html	X_refsource_confirm
http://www.securityfocus.com/bid/73061	Vdb Entry

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
http://lists.fedoraproject.org/pipermail/package-announce/2015-March/151943.html	2023-02-13
http://lists.fedoraproject.org/pipermail/package-announce/2015-March/152362.html	2023-02-13
http://lists.fedoraproject.org/pipermail/package-announce/2015-March/153933.html	2023-02-13
http://www.debian.org/security/2015/dsa-3182	2023-02-13
http://www.libssh2.org/adv_20150311.html	2023-02-13
http://www.mandriva.com/security/advisories?name=MDVSA-2015:148	2023-02-13
https://access.redhat.com/security/cve/CVE-2015-1782	2015-11-19
https://bugzilla.redhat.com/show_bug.cgi?id=1199511	2015-11-19

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				7.0 Search vendor "Debian" for product "Debian Linux" and version "7.0"		-		Affected
Libssh2 Search vendor "Libssh2"		Libssh2 Search vendor "Libssh2" for product "Libssh2"				<= 1.4.3 Search vendor "Libssh2" for product "Libssh2" and version " <= 1.4.3"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				20 Search vendor "Fedoraproject" for product "Fedora" and version "20"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				21 Search vendor "Fedoraproject" for product "Fedora" and version "21"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				22 Search vendor "Fedoraproject" for product "Fedora" and version "22"		-		Affected