Risk | Low |
Patch available | YES |
Number of vulnerabilities | 3 |
CVE-ID | CVE-2020-9445 CVE-2020-9444 CVE-2020-10935 |
CWE-ID | CWE-79 CWE-1022 |
Exploitation vector | Network |
Public exploit | Public exploit code for vulnerability #3 is available. |
Vulnerable software Subscribe |
Zulip Server Web applications / Other software |
Vendor | Zulip |
Security Bulletin
This security bulletin contains information about 3 vulnerabilities.
EUVDB-ID: #VU27391
Risk: Low
CVSSv3.1: 5.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2020-9445
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 in the "modal_link" feature in the Markdown functionality. 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.
MitigationInstall update from vendor's website.
Vulnerable software versionsZulip Server: 1.1.5 - 2.1.2
External linkshttp://blog.zulip.org/2020/04/01/zulip-server-2-1-3-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.
EUVDB-ID: #VU27392
Risk: Low
CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2020-9444
CWE-ID:
CWE-1022 - Use of Web Link to Untrusted Target with window.opener Access
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to modify certain properties on the affected system.
The vulnerability exist due to Reverse Tabnabbing in the Markdown functionality. A remote attacker can modify the location property to automatically redirect the user to a malicious site.
MitigationInstall updates from vendor's website.
Vulnerable software versionsZulip Server: 1.1.5 - 2.1.2
External linkshttp://blog.zulip.org/2020/04/01/zulip-server-2-1-3-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.
EUVDB-ID: #VU27393
Risk: Low
CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N/E:P/RL:O/RC:C]
CVE-ID: CVE-2020-10935
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 in a Markdown link. A remote attacker can inject 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.
MitigationInstall update from vendor's website.
Vulnerable software versionsZulip Server: 2.1.2
External linkshttp://blog.zulip.org/2020/04/01/zulip-server-2-1-3-security-release/
http://www.coresecurity.com/advisories/zulip-account-takeover-stored-xss
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. However, proof of concept for this vulnerability is available.