Full Disclosure: Open-Xchange Security Advisory 2018-06-08


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Open-Xchange Security Advisory 2018-06-08


From: Open-Xchange GmbH
Date: Fri, 8 Jun 2018 11:16:45 +0200


Dear subscribers,

we've migrated our public disclosure workflow to full-disclosure and are catching up on publishing recent 
vulnerabilities through this channel. Feel free to join our bug bounty programs (open-xchange, dovecot, powerdns) at 
HackerOne.

Yours sincerely,
 Martin Heiland, Open-Xchange GmbH



Product: OX App Suite
Vendor: OX Software GmbH


Internal reference: 55872 (Bug ID)
Vulnerability type: Cross-Site Scripting (CWE-80)
Vulnerable version: 7.8.4 and earlier
Vulnerable component: frontend
Report confidence: Confirmed
Solution status: Fixed by Vendor
Fixed version: 7.6.3-rev30, 7.8.2-rev30, 7.8.3-rev36, 7.8.4-rev18
Vendor notification: 2017-10-18
Solution date: 2018-02-08
Public disclosure: 2018-06-08
CVE reference: CVE-2018-5754
CVSS: n/a

Vulnerability Details:
Internet Explorer does not properly support modern Content Security Policies ("CSP"), which act as a failsafe for 
certain XSS attacks. Since the "Open in Browser" feature is a potential attack vector to inject malicious content, we 
removed that option at the user interface. Instead, users shall download attachments and open them from their device. 
This removes the issue of executing script-code under the same domain.

Risk:
Malicious script code can be executed within a users context. This can lead to session hijacking or triggering unwanted 
actions via the web interface (sending mail, deleting data etc.).

Steps to reproduce:
1. This is a precautionary change

Solution:
We no longer offer "Open in Browser" for IE based browsers. Microsoft Edge is not affected by this change.

---

Internal reference: 56333 (Bug ID)
Vulnerability type: Improper Privilege Management (CWE-269)
Vulnerable version: 7.8.4 and earlier
Vulnerable component: backend
Report confidence: Confirmed
Solution status: Fixed by Vendor
Fixed version: 7.6.3-rev36, 7.8.2-rev39, 7.8.3-rev44, 7.8.4-rev22
Vendor notification: 2017-11-30
Solution date: 2018-02-08
Public disclosure: 2018-06-08
Researcher Credits: Michael Reizelman
CVE reference: CVE-2018-5756
CVSS: 4.3 (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N)

Vulnerability Details:
Permission checks for tasks were incomplete with regards to folder-to-object association.

Risk:
Users within the same context could delete other users tasks.

Steps to reproduce:
1. Create a task as User A (ID: 1)
2. As User B, trigger a /api/tasks?action=delete call with task ID 1 but a valid task folder ID of User B

Solution:
We enhanced permission checks for tasks for the "delete" call and check for folder-to-object association.

---

Internal reference: 56359 (Bug ID)
Vulnerability type: Improper Privilege Management (CWE-269)
Vulnerable version: 7.8.4 and earlier
Vulnerable component: backend
Report confidence: Confirmed
Solution status: Fixed by Vendor
Fixed version: 7.6.3-rev36, 7.8.2-rev39, 7.8.3-rev44, 7.8.4-rev22
Vendor notification: 2017-12-01
Solution date: 2018-02-08
Public disclosure: 2018-06-08
Researcher Credits: Michael Reizelman
CVE reference: CVE-2018-5756
CVSS: 4.3 (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N)

Vulnerability Details:
Permission checks for appointments were incomplete with regards to folder-to-object association.

Risk:
Users within the same context were able to add external participants to other users appointments. Those users would 
potentially get notified about subsequent appointment changes and could therefor gather information beyond their 
permission level.

Steps to reproduce:
1. Create a appointment as User A (ID: 1)
2. As User B, trigger a /api/calendar?action=confirm call with appointment ID 1 but a valid appointment folder ID of 
User B
3. Include a external participant in this "confirm" call

{"confirmmessage":"","confirmation":1, "type":5, "mail":"test () example com"}

Solution:
We enhanced permission checks for appointments for the "confirm" call and check for folder-to-object association.

---

Internal reference: 56334 (Bug ID)
Vulnerability type: Server-Side Request Forgery (CWE-918)
Vulnerable version: 7.8.4 and earlier
Vulnerable component: backend
Report confidence: Confirmed
Solution status: Fixed by Vendor
Fixed version: 7.6.3-rev36, 7.8.2-rev39, 7.8.3-rev44, 7.8.4-rev22
Vendor notification: 2017-11-30
Solution date: 2018-02-08
Public disclosure: 2018-06-08
Researcher Credits: Alan Watt
CVE reference: CVE-2018-5752
CVSS: 6.4 (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:L)

Vulnerability Details:
OX App Suite tries to look up external mail account configuration using XML files for auto-configuration, that are 
placed at most mail providers hosts. Redirects of external HTTP services could be used to access local or internal 
networks instead, when looking up that external account information.

Risk:
By validating error codes and request duration, attackers can get insight about internal network configuration, open 
ports and associated services. Such information can serve as reconnaissance for further attacks.

Steps to reproduce:
1. Provide a malicious HTTP service that redirects any incoming request to a local IP/Port combination using HTTP 301.
2. Attempt to add a external mail account that uses the same domain as the malicious HTTP service
3. Check error codes and response times of the /api/autoconfig?action=get request

Solution:
We now deny access to network internal endpoints when following HTTP redirects.

---

Internal reference: 56407 (Bug ID)
Vulnerability type: Content Spoofing (CWE-451)
Vulnerable version: 7.8.4 and earlier
Vulnerable component: frontend
Report confidence: Confirmed
Solution status: Fixed by Vendor
Fixed version: 7.6.3-rev31, 7.8.2-rev31, 7.8.3-rev41, 7.8.4-rev20
Vendor notification: 2017-12-06
Solution date: 2018-02-08
Public disclosure: 2018-06-08
CVE reference: CVE-2018-5753
CVSS: 4.3 (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N)

Vulnerability Details:
The origin of a E-Mail is determined by the "From" or "Sender" address, which are provided by Mail headers and usually 
consist of a arbitrary personal part "Mr. Foo Bar (CEO)" and the actual sender address "". Using 
specific unicode characters at the personal part could be used to disguise the actual origin of the E-Mail.

Risk:
Attackers can use this vulnerability to support social-engineering based attacks to individual users by tampering the 
origin of an E-Mail.

Steps to reproduce:
1. Create a E-Mail which contains very long "personal" parts or mail addresses as personal parts.

Solution:
We now display the actual sender address next to the "personal" part of the sender and make sure that this information 
cannot be influenced by externally provided content.

---

Internal reference: 56056 (Bug ID)
Vulnerability type: Improper Privilege Management (CWE-269)
Vulnerable version: 7.8.4 and earlier
Vulnerable component: backend
Report confidence: Confirmed
Solution status: Fixed by Vendor
Fixed version: 7.6.3-rev35, 7.8.2-rev38, 7.8.3-rev41, 7.8.4-rev19
Vendor notification: 2017-11-08
Solution date: 2017-12-13
Public disclosure: 2018-06-08
Researcher Credits: Alan Watt
CVE reference: CVE-2017-17062
CVSS: 3.1 (CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N)

Vulnerability Details:
Certain "user attributes" (UA identifier, login timestamps...) can be saved by using arbitrary users identifiers within 
the same context. The original intention was to allow this for users with elevated permissions.

Risk:
While no way to access other users attributes is known, this can be used to void non-repudiation.

Steps to reproduce:
1. Forge a API request to store/request custom user attributes for a different user (ID: 3)

Proof of concept:
PUT https://example.com/ajax/user?session=xxx&name=tree&id=3&action=setAttribute
{"name":"foo", "value": "bar"}

Solution:
We check permissions on a user- and context-level to make sure just privileged users can set and read user attributes.

---

Internal reference: 56580 (Bug ID)
Vulnerability type: Cross-Site Scripting (CWE-80)
Vulnerable version: 7.8.4 and earlier
Vulnerable component: office-web
Report confidence: Confirmed
Solution status: Confirmed
Solution status: Fixed by Vendor
Fixed version: 7.8.3-rev12, 7.8.4-rev9
Vendor notification: 2017-12-22
Solution date: 2018-02-08
Public disclosure: 2018-06-08
CVE reference: CVE-2018-5754
CVSS: 5.4 (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N)

Vulnerability Details:
Script code within Presentations is being executed when transferring it to the clipboard. This is done by "copying" or 
"cutting" text using keyboard commands.

Risk:
Malicious script code can be executed within a users context. This can lead to session hijacking or triggering unwanted 
actions via the web interface (sending mail, deleting data etc.).

Steps to reproduce:
1. Create a malicious presentation file which contains script-code as text
2. Cloak the code by using low-contrast colors, font sizes etc.

Proof of concept:
">

Solution:
We make sure that client-side content gets cleaned up and not evaluated before transferring to the clipboard.

---

Internal reference: 56582 (Bug ID)
Vulnerability type: Cross-Site Scripting (CWE-80)
Vulnerable version: 7.8.4 and earlier
Vulnerable component: backend
Report confidence: Confirmed
Solution status: Fixed by Vendor
Fixed version: 7.6.3-rev36, 7.8.2-rev39, 7.8.3-rev44, 7.8.4-rev22
Vendor notification: 2017-12-22
Solution date: 2018-02-08
Public disclosure: 2018-06-08
Researcher Credits: Secator
CVE reference: CVE-2018-5754
CVSS: 5.4 (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N)

Vulnerability Details:
Malformed CSS can be used to inject script code.

Risk:
Malicious script code can be executed within a users context. This can lead to session hijacking or triggering unwanted 
actions via the web interface (sending mail, deleting data etc.).

Steps to reproduce:
1. Create a malicious E-Mail and send it to a OX App Suite user
2. Open that E-Mail as user

Proof of concept:


Solution:
We enhanced the sanitizer to consider malformed CSS content and improve stability.

---

Internal reference: 56619 (Bug ID)
Vulnerability type: Server-Side Request Forgery (CWE-918)
Vulnerable version: 7.8.4 and earlier
Vulnerable component: backend
Report confidence: Confirmed
Solution status: Fixed by Vendor
Fixed version: 7.6.3-rev36, 7.8.2-rev39, 7.8.3-rev44, 7.8.4-rev22
Vendor notification: 2018-01-03
Solution date: 2018-02-08
Public disclosure: 2018-06-08
Researcher Credits: Alan Watt
CVE reference: CVE-2018-5752
CVSS: 6.4 (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:L)

Vulnerability Details:
OX App Suite can be used to embed external RSS feeds, which are requested using HTTP. Redirects of external HTTP 
services could be used to access local or internal networks instead, when looking up that external account information.

Risk:
By validating error codes and request duration, attackers can get insight about internal network configuration, open 
ports and associated services. Such information can serve as reconnaissance for further attacks.

Steps to reproduce:
1. Provide a malicious HTTP service that redirects any incoming HTTP request to a local IP/Port combination using HTTP 
301.
2. Add a RSS feed that points to the same host as the malicious HTTP service

Solution:
We now deny access to network internal endpoints when following HTTP redirects.

---

Internal reference: 56477 (Bug ID)
Vulnerability type: Information Exposure (CWE-200)
Vulnerable version: 7.8.4 and earlier
Vulnerable component: backend
Report confidence: Confirmed
Solution status: Fixed by Vendor
Fixed version: 7.6.3-rev36, 7.8.2-rev39, 7.8.3-rev44, 7.8.4-rev22
Vendor notification: 2017-12-12
Solution date: 2018-02-08
Public disclosure: 2018-06-08
CVE reference: CVE-2018-5751
CVSS: 4.3 (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N)

Vulnerability Details:
Inviting external users to share content creates temporary user accounts to handle permissions. Several APIs expose 
information about user accounts, however data of external guests is not meant to be available for others than the 
sharee and users that got access to the shared content.

Risk:
Information about guest users, primarily E-Mail addresses, is available to all users within the same context even 
though they are not entitled to access it.

Steps to reproduce:
1. Share content with an external user by using the "invite by mail" option
2. As another user of the same context, query the "groups" and "users" API


Solution:
We restrict access to guest user data and reduce the amount of data provided for groups.

---

Internal reference: 56706 (Bug ID)
Vulnerability type: Server-Side Request Forgery (CWE-918)
Vulnerable version: 7.8.4 and earlier
Vulnerable component: backend
Report confidence: Confirmed
Solution status: Fixed by Vendor
Fixed version: 7.6.3-rev36, 7.8.2-rev39, 7.8.3-rev44, 7.8.4-rev22
Vendor notification: 2017-10-16
Solution date: 2018-02-08
Public disclosure: 2018-06-08
Researcher Credits: Alan Watt
CVE reference: CVE-2018-5752
CVSS: 6.4 (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:L)

Vulnerability Details:
OX App Suite uses several blacklists to restrict access of external services. Those do not cover non-decimal 
representations of IP addresses and special IPv6 related addresses. Some libraries accept such values but our blacklist 
fails to convert them when checking.

Risk:
Attackers can forge server-side requests to internal systems to gather information about network infrastructure and 
services.

Proof of concept:
1. Convert the IP address of a internal host, which is protected by a blacklist, to a octal or hexadecimal value
127.0.0.1: 0177.00.00.01 (8-bit octal) or 0x7f00000 (32-bit hexadecimal)

2. Use IPv6 mapping of IPv4 addresses
127.0.0.1: 0:0:0:0:0:FFFF:7F00:0001

3. Use very special representations of "local" addresses
127.0.0.1: 0000

4. Use IPv6 local addresses
127.0.0.1: :: or ::1

Solution:
We did adjust our blacklist implementation to cover IPv6 and other representations of restricted addresses.

---

Internal reference: 56718 (Bug ID)
Vulnerability type: Path Traversal (CWE-22)
Vulnerable version: 7.8.4 and earlier
Vulnerable component: readerengine
Report confidence: Confirmed
Solution status: Fixed by Vendor
Fixed version: 7.6.3-rev3, 7.8.2-rev4, 7.8.3-rev5, 7.8.4-rev4
Vendor notification: 2018-01-10
Solution date: 2018-02-08
Public disclosure: 2018-06-08
Researcher Credits: Zhang Tianqi(pnig0s)
CVE reference: CVE-2018-5755
CVSS: 7.7 (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N)

Vulnerability Details:
Specifically crafted spreadsheets can be exploited to extract system information, including content and location of 
local files.

Risk:
Attackers can read local files of the host running the "readerengine" component depending on their local access 
permissions for the "open-xchange" user. This includes configuration files which potentially include passwords and 
other sensitive information. Some functions allow to access internal system information like operating system and 
paths. Other than that its possible to check the existence of certain files that provide hints about patch level and 
other details.

Steps to reproduce:
1. Create a malicious ODS based spreadsheet and use formulas that reference local files or read system information

Proof of concept:
=WEBSERVICE("file:///etc/passwd")
=CELL("filename")
=INFO("system")

Solution:
We now filter ODS and OOXML function content against a blacklist.

---

Internal reference: 56740 (Bug ID)
Vulnerability type: Cross-Site Scripting (CWE-80)
Vulnerable version: 7.8.4 and earlier
Vulnerable component: backend
Report confidence: Confirmed
Solution status: Fixed by Vendor
Fixed version: 7.6.3-rev3, 7.8.2-rev4, 7.8.3-rev5, 7.8.4-rev4
Vendor notification: 2018-01-12
Solution date: 2018-04-24
Public disclosure: 2018-06-08
Researcher Credits: Secator
CVE reference: CVE-2018-5754
CVSS: 5.4 (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N)

Vulnerability Details:
Media-types can be altered in a way that our content scanner is circumvented and potentially harmful content gets 
passed to the requesting client.

Risk:
Malicious script code can be executed within a users context. This can lead to session hijacking or triggering unwanted 
actions via the web interface (sending mail, deleting data etc.).

Steps to reproduce:
1. Create a malicious XML file and modify its media-type
2. Upload, embed and make someone open this file

Proof of concept:
"t,text/html" or "t/@,image/svg+xml"
"garbageu00ff/garbage" (will work for Firefox as it "guesses" the media-type based on the filename and multipart data)

Solution:
We now reject to define media-types which are not covered by application logic.

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