CVE-2011-2192

curl: Improper delegation of client credentials during GSS negotiation

Severity Score

9.8

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

The Curl_input_negotiate function in http_negotiate.c in libcurl 7.10.6 through 7.21.6, as used in curl and other products, always performs credential delegation during GSSAPI authentication, which allows remote servers to impersonate clients via GSSAPI requests.

La función Curl_input_negotiate en http_negotiate.c en libcurl v7.10.6 a v7.21.6, tal y como se utiliza en curl y otras aplicaciones, siempre lleva a cabo delegación de credenciales durante la autenticación GSSAPI, lo que permite a hacerse pasar por clientes legitimos a servidores remotos a través de peticiones GSSAPI.

Richard Silverman discovered that when doing GSSAPI authentication, libcurl unconditionally performs credential delegation, handing the server a copy of the client's security credential. Wesley Miaw discovered that when zlib is enabled, libcurl does not properly restrict the amount of callback data sent to an application that requests automatic decompression. This might allow an attacker to cause a denial of service via an application crash or possibly execute arbitrary code with the privilege of the application. This issue only affected Ubuntu 8.04 LTS and Ubuntu 10.04 LTS. Various other issues were also addressed.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2011-05-31 CVE Reserved
2011-06-24 CVE Published
2024-08-06 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-255: Credentials Management Errors

CAPEC

References (20)

URL	Tag	Source
http://curl.haxx.se/curl-gssapi-delegation.patch	Broken Link
http://secunia.com/advisories/45047	Third Party Advisory
http://secunia.com/advisories/45067	Third Party Advisory
http://secunia.com/advisories/45088	Third Party Advisory
http://secunia.com/advisories/45144	Third Party Advisory
http://secunia.com/advisories/45181	Third Party Advisory
http://secunia.com/advisories/48256	Third Party Advisory
http://support.apple.com/kb/HT5130	Third Party Advisory
http://www.securitytracker.com/id?1025713	Third Party Advisory

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
http://curl.haxx.se/docs/adv_20110623.html	2020-05-27
http://lists.apple.com/archives/security-announce/2012/Feb/msg00000.html	2020-05-27
http://lists.fedoraproject.org/pipermail/package-announce/2011-July/062287.html	2020-05-27
http://lists.fedoraproject.org/pipermail/package-announce/2011-June/061992.html	2020-05-27
http://security.gentoo.org/glsa/glsa-201203-02.xml	2020-05-27
http://www.debian.org/security/2011/dsa-2271	2020-05-27
http://www.mandriva.com/security/advisories?name=MDVSA-2011:116	2020-05-27
http://www.redhat.com/support/errata/RHSA-2011-0918.html	2020-05-27
http://www.ubuntu.com/usn/USN-1158-1	2020-05-27
https://bugzilla.redhat.com/show_bug.cgi?id=711454	2011-07-05
https://access.redhat.com/security/cve/CVE-2011-2192	2011-07-05

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Haxx Search vendor "Haxx"		Libcurl Search vendor "Haxx" for product "Libcurl"				>= 7.10.6 <= 7.21.6 Search vendor "Haxx" for product "Libcurl" and version " >= 7.10.6 <= 7.21.6"		-		Affected
Apple Search vendor "Apple"		Mac Os X Search vendor "Apple" for product "Mac Os X"				< 10.7.3 Search vendor "Apple" for product "Mac Os X" and version " < 10.7.3"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				14 Search vendor "Fedoraproject" for product "Fedora" and version "14"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				15 Search vendor "Fedoraproject" for product "Fedora" and version "15"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				5.0 Search vendor "Debian" for product "Debian Linux" and version "5.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				6.0 Search vendor "Debian" for product "Debian Linux" and version "6.0"		-		Affected
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
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				8.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "8.04"		lts		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				10.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "10.04"		lts		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				10.10 Search vendor "Canonical" for product "Ubuntu Linux" and version "10.10"		-		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				11.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "11.04"		-		Affected