Zulip Server up to 1.7.1 Storage Backend cross site scripting

CVSS Meta Temp Score
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CTI Interest Score
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4.3$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Zulip Server up to 1.7.1. This affects an unknown part of the component Storage Backend. The manipulation leads to cross site scripting. This vulnerability is uniquely identified as CVE-2018-9999. The attack is possible to be carried out remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Zulip Server up to 1.7.1. This issue affects an unknown functionality of the component Storage Backend. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Impacted is integrity. The summary by CVE is:

In Zulip Server versions before 1.7.2, there was an XSS issue with user uploads and the (default) LOCAL_UPLOADS_DIR storage backend.

The bug was discovered 04/12/2018. The weakness was disclosed 04/18/2018 (Website). It is possible to read the advisory at blog.zulip.org. The identification of this vulnerability is CVE-2018-9999 since 04/10/2018. The attack may be initiated remotely. The successful exploitation needs a simple authentication. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

The vulnerability was handled as a non-public zero-day exploit for at least 6 days. During that time the estimated underground price was around $0-$5k.

Upgrading to version 1.7.2 eliminates this vulnerability.

The entries VDB-116324, VDB-116325 and VDB-116326 are pretty similar. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.4

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.4
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Cross site scripting
CWE: CWE-79 / CWE-94 / CWE-74
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Server 1.7.2

Timelineinfo

04/10/2018 🔍
04/12/2018 +2 days 🔍
04/18/2018 +5 days 🔍
04/18/2018 +0 days 🔍
04/18/2018 +0 days 🔍
01/25/2020 +647 days 🔍

Sourcesinfo

Advisory: blog.zulip.org
Status: Not defined
Confirmation: 🔍

CVE: CVE-2018-9999 (🔍)
GCVE (CVE): GCVE-0-2018-9999
GCVE (VulDB): GCVE-100-116327
See also: 🔍

Entryinfo

Created: 04/18/2018 16:14
Updated: 01/25/2020 20:25
Changes: 04/18/2018 16:14 (59), 01/25/2020 20:25 (2)
Complete: 🔍
Cache ID: 216::103

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