Multiple vulnerabilities in Zulip Server
| Risk | High |
| Patch available | YES |
| Number of vulnerabilities | 4 |
| CVE-ID | CVE-2020-12759 CVE-2020-14194 CVE-2020-14215 CVE-2020-15070 |
| CWE-ID | CWE-79 CWE-20 CWE-284 CWE-74 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
Zulip Server Web applications / Other software |
| Vendor | Zulip |
Security Bulletin
This security bulletin contains information about 4 vulnerabilities.
1) Cross-site scripting
EUVDB-ID: #VU46087
Risk: Low
CVSSv3.1: 3.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2020-12759
CWE-ID:
CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Exploit availability: No
DescriptionThe disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.
The vulnerability exists due to insufficient sanitization of user-supplied data passed via the Dropbox webhook. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.
Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.
MitigationUpdate to version 2.1.5.
Vulnerable software versionsZulip Server: 2.1.0 - 2.1.4
External linkshttp://blog.zulip.com/2020/06/17/zulip-server-2-1-5-security-release/
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
2) Input validation error
EUVDB-ID: #VU46086
Risk: Medium
CVSSv3.1: 3.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2020-14194
CWE-ID:
CWE-20 - Improper input validation
Exploit availability: No
DescriptionThe vulnerability allows a remote non-authenticated attacker to read and manipulate data.
Zulip Server before 2.1.5 allows reverse tabnapping via a topic header link.
MitigationInstall update from vendor's website.
Vulnerable software versionsZulip Server: 2.1.0 - 2.1.4
External linkshttp://blog.zulip.com/2020/06/17/zulip-server-2-1-5-security-release/
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
3) Improper access control
EUVDB-ID: #VU46085
Risk: Medium
CVSSv3.1: 3.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2020-14215
CWE-ID:
CWE-284 - Improper Access Control
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to gain unauthorized access to sensitive information.
The vulnerability exists due to improper access restrictions. A remote attacker can send a specially crafted request and gain unauthorized access to the affected application.
MitigationUpdate to version 2.1.5.
Vulnerable software versionsZulip Server: 2.1.0 - 2.1.4
External linkshttp://blog.zulip.com/2020/06/17/zulip-server-2-1-5-security-release/
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
4) Improper Neutralization of Special Elements in Output Used by a Downstream Component
EUVDB-ID: #VU46084
Risk: High
CVSSv3.1: 3.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2020-15070
Exploit availability: No
DescriptionThe vulnerability allows a remote authenticated user to execute arbitrary code.
Zulip Server 2.x before 2.1.7 allows eval injection if a privileged attacker were able to write directly to the postgres database, and chose to write a crafted custom profile field value.
MitigationInstall update from vendor's website.
Vulnerable software versionsZulip Server: 2.1.0 - 2.1.6
External linkshttp://blog.zulip.com/2020/06/26/zulip-server-2-1-7-security-release/
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
