CVE-2012-4561

Gentoo Linux Security Advisory 201402-26

Severity Score

7.5

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

The (1) publickey_make_dss, (2) publickey_make_rsa, (3) signature_from_string, (4) ssh_do_sign, and (5) ssh_sign_session_id functions in keys.c in libssh before 0.5.3 free "an invalid pointer on an error path," which might allow remote attackers to cause a denial of service (crash) via unspecified vectors.

Las funciones (1) publickey_make_dss, (2) publickey_make_rsa, (3) signature_from_string, (4) ssh_do_sign y (5) ssh_sign_session_id en keys.c en libssh en versiones anteriores a la 0.5.3 liberan "un puntero no válido en una ruta errónea", lo que podría permitir a atacantes remotos provocar una denegación de servicio (caída) a través de vectores no especificados.

Multiple double free flaws, buffer overflow flaws, invalid free flaws, and improper overflow checks in libssh before 0.5.3 could enable a denial of service attack against libssh clients, or possibly arbitrary code execution. Yong Chuan Koh discovered that libssh incorrectly handled certain negotiation requests. A remote attacker could use this to cause libssh to crash, resulting in a denial of service.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2012-08-21 CVE Reserved
2012-11-27 CVE Published
2024-08-06 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CAPEC

References (13)

URL	Tag	Source
http://www.openwall.com/lists/oss-security/2012/11/20/3	Mailing List
http://www.securityfocus.com/bid/56604	Vdb Entry
https://bugzilla.redhat.com/show_bug.cgi?id=871617	X_refsource_misc
https://exchange.xforce.ibmcloud.com/vulnerabilities/80220	Vdb Entry

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
http://lists.fedoraproject.org/pipermail/package-announce/2012-November/093313.html	2017-08-29
http://lists.fedoraproject.org/pipermail/package-announce/2012-November/093474.html	2017-08-29
http://lists.opensuse.org/opensuse-security-announce/2012-12/msg00002.html	2017-08-29
http://lists.opensuse.org/opensuse-updates/2012-12/msg00016.html	2017-08-29
http://lists.opensuse.org/opensuse-updates/2013-01/msg00021.html	2017-08-29
http://www.debian.org/security/2012/dsa-2577	2017-08-29
http://www.libssh.org/2012/11/20/libssh-0-5-3-security-release	2017-08-29
http://www.mandriva.com/security/advisories?name=MDVSA-2012:175	2017-08-29
http://www.ubuntu.com/usn/USN-1640-1	2017-08-29

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Libssh Search vendor "Libssh"		Libssh Search vendor "Libssh" for product "Libssh"				<= 0.5.2 Search vendor "Libssh" for product "Libssh" and version " <= 0.5.2"		-		Affected
Libssh Search vendor "Libssh"		Libssh Search vendor "Libssh" for product "Libssh"				0.4.7 Search vendor "Libssh" for product "Libssh" and version "0.4.7"		-		Affected
Libssh Search vendor "Libssh"		Libssh Search vendor "Libssh" for product "Libssh"				0.4.8 Search vendor "Libssh" for product "Libssh" and version "0.4.8"		-		Affected
Libssh Search vendor "Libssh"		Libssh Search vendor "Libssh" for product "Libssh"				0.5.0 Search vendor "Libssh" for product "Libssh" and version "0.5.0"		-		Affected
Libssh Search vendor "Libssh"		Libssh Search vendor "Libssh" for product "Libssh"				0.5.0 Search vendor "Libssh" for product "Libssh" and version "0.5.0"		rc1		Affected
Libssh Search vendor "Libssh"		Libssh Search vendor "Libssh" for product "Libssh"				0.5.1 Search vendor "Libssh" for product "Libssh" and version "0.5.1"		-		Affected