CVE-2016-0736

Apache mod_session_crypto - Padding Oracle

Severity Score

7.5

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

In Apache HTTP Server versions 2.4.0 to 2.4.23, mod_session_crypto was encrypting its data/cookie using the configured ciphers with possibly either CBC or ECB modes of operation (AES256-CBC by default), hence no selectable or builtin authenticated encryption. This made it vulnerable to padding oracle attacks, particularly with CBC.

En Apache HTTP Server versiones 2.4.0 hasta 2.4.23, mod_session_crypto fue cifraba su cookie y datos utilizando los cifrados configurados posiblemente con los modos de operación CBC o ECB (AES256-CBC por defecto), por lo tanto, no se puede seleccionar ni crear cifrado autenticado integrado. Esto lo hizo vulnerable a los ataques de tipo oráculo de relleno (padding oracle), particularmente con CBC.

It was discovered that the mod_session_crypto module of httpd did not use any mechanisms to verify integrity of the encrypted session data stored in the user's browser. A remote attacker could use this flaw to decrypt and modify session data using a padding oracle attack.

Apache mod_session_crypto versions 2.3 through 2.5 suffer form a padding oracle vulnerability.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

High

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2015-12-16 CVE Reserved
2016-12-23 CVE Published
2024-09-16 CVE Updated
2024-09-16 First Exploit
2024-09-17 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-287: Improper Authentication
CWE-310: Cryptographic Issues

CAPEC

References (29)

URL	Tag	Source
http://www.securityfocus.com/bid/95078	Third Party Advisory
http://www.securitytracker.com/id/1037508	Third Party Advisory
https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03725en_us	Third Party Advisory
https://lists.apache.org/thread.html/56c2e7cc9deb1c12a843d0dc251ea7fd3e7e80293cde02fcd65286ba%40%3Ccvs.httpd.apache.org%3E	Mailing List
https://lists.apache.org/thread.html/84a3714f0878781f6ed84473d1a503d2cc382277e100450209231830%40%3Ccvs.httpd.apache.org%3E	Mailing List
https://lists.apache.org/thread.html/r04e89e873d54116a0635ef2f7061c15acc5ed27ef7500997beb65d6f%40%3Ccvs.httpd.apache.org%3E	Mailing List
https://lists.apache.org/thread.html/r76142b8c5119df2178be7c2dba88fde552eedeec37ea993dfce68d1d%40%3Ccvs.httpd.apache.org%3E	Mailing List
https://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3E	Mailing List
https://lists.apache.org/thread.html/rb14daf9cc4e28d18cdc15d6a6ca74e565672fabf7ad89541071d008b%40%3Ccvs.httpd.apache.org%3E	Mailing List
https://lists.apache.org/thread.html/rc998b18880df98bafaade071346690c2bc1444adaa1a1ea464b93f0a%40%3Ccvs.httpd.apache.org%3E	Mailing List
https://lists.apache.org/thread.html/rcc44594d4d6579b90deccd4536b5d31f099ef563df39b094be286b9e%40%3Ccvs.httpd.apache.org%3E	Mailing List
https://lists.apache.org/thread.html/rd18c3c43602e66f9cdcf09f1de233804975b9572b0456cc582390b6f%40%3Ccvs.httpd.apache.org%3E	Mailing List
https://lists.apache.org/thread.html/re1e3a24664d35bcd0a0e793e0b5fc6ca6c107f99a1b2c545c5d4b467%40%3Ccvs.httpd.apache.org%3E	Mailing List
https://lists.apache.org/thread.html/re3d27b6250aa8548b8845d314bb8a350b3df326cacbbfdfe4d455234%40%3Ccvs.httpd.apache.org%3E	Mailing List
https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E	Mailing List
https://security.netapp.com/advisory/ntap-20180423-0001	X_refsource_confirm
https://support.apple.com/HT208221	X_refsource_confirm
https://www.tenable.com/security/tns-2017-04	X_refsource_confirm

URL	Date	SRC
https://www.exploit-db.com/exploits/40961	2024-09-16

URL	Date	SRC

URL	Date	SRC
http://rhn.redhat.com/errata/RHSA-2017-1415.html	2023-11-07
http://www.debian.org/security/2017/dsa-3796	2023-11-07
https://access.redhat.com/errata/RHSA-2017:0906	2023-11-07
https://access.redhat.com/errata/RHSA-2017:1161	2023-11-07
https://access.redhat.com/errata/RHSA-2017:1413	2023-11-07
https://access.redhat.com/errata/RHSA-2017:1414	2023-11-07
https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2016-0736	2023-11-07
https://security.gentoo.org/glsa/201701-36	2023-11-07
https://access.redhat.com/security/cve/CVE-2016-0736	2017-06-07
https://bugzilla.redhat.com/show_bug.cgi?id=1406744	2017-06-07

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Apache Search vendor "Apache"		Http Server Search vendor "Apache" for product "Http Server"				2.4.0 Search vendor "Apache" for product "Http Server" and version "2.4.0"		-		Affected
Apache Search vendor "Apache"		Http Server Search vendor "Apache" for product "Http Server"				2.4.1 Search vendor "Apache" for product "Http Server" and version "2.4.1"		-		Affected
Apache Search vendor "Apache"		Http Server Search vendor "Apache" for product "Http Server"				2.4.2 Search vendor "Apache" for product "Http Server" and version "2.4.2"		-		Affected
Apache Search vendor "Apache"		Http Server Search vendor "Apache" for product "Http Server"				2.4.3 Search vendor "Apache" for product "Http Server" and version "2.4.3"		-		Affected
Apache Search vendor "Apache"		Http Server Search vendor "Apache" for product "Http Server"				2.4.6 Search vendor "Apache" for product "Http Server" and version "2.4.6"		-		Affected
Apache Search vendor "Apache"		Http Server Search vendor "Apache" for product "Http Server"				2.4.7 Search vendor "Apache" for product "Http Server" and version "2.4.7"		-		Affected
Apache Search vendor "Apache"		Http Server Search vendor "Apache" for product "Http Server"				2.4.8 Search vendor "Apache" for product "Http Server" and version "2.4.8"		-		Affected
Apache Search vendor "Apache"		Http Server Search vendor "Apache" for product "Http Server"				2.4.9 Search vendor "Apache" for product "Http Server" and version "2.4.9"		-		Affected
Apache Search vendor "Apache"		Http Server Search vendor "Apache" for product "Http Server"				2.4.10 Search vendor "Apache" for product "Http Server" and version "2.4.10"		-		Affected
Apache Search vendor "Apache"		Http Server Search vendor "Apache" for product "Http Server"				2.4.12 Search vendor "Apache" for product "Http Server" and version "2.4.12"		-		Affected
Apache Search vendor "Apache"		Http Server Search vendor "Apache" for product "Http Server"				2.4.14 Search vendor "Apache" for product "Http Server" and version "2.4.14"		-		Affected
Apache Search vendor "Apache"		Http Server Search vendor "Apache" for product "Http Server"				2.4.16 Search vendor "Apache" for product "Http Server" and version "2.4.16"		-		Affected
Apache Search vendor "Apache"		Http Server Search vendor "Apache" for product "Http Server"				2.4.19 Search vendor "Apache" for product "Http Server" and version "2.4.19"		-		Affected
Apache Search vendor "Apache"		Http Server Search vendor "Apache" for product "Http Server"				2.4.20 Search vendor "Apache" for product "Http Server" and version "2.4.20"		-		Affected
Apache Search vendor "Apache"		Http Server Search vendor "Apache" for product "Http Server"				2.4.21 Search vendor "Apache" for product "Http Server" and version "2.4.21"		-		Affected
Apache Search vendor "Apache"		Http Server Search vendor "Apache" for product "Http Server"				2.4.22 Search vendor "Apache" for product "Http Server" and version "2.4.22"		-		Affected
Apache Search vendor "Apache"		Http Server Search vendor "Apache" for product "Http Server"				2.4.23 Search vendor "Apache" for product "Http Server" and version "2.4.23"		-		Affected