Multiple vulnerabilities in Zulip Server
| Risk | Low |
| Patch available | YES |
| Number of vulnerabilities | 4 |
| CVE-ID | CVE-2018-9999 CVE-2018-9990 CVE-2018-9987 CVE-2018-9986 |
| CWE-ID | CWE-79 |
| 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: #VU14655
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-2018-9999
CWE-ID:
CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Exploit availability: No
DescriptionVulnerability allows a remote attacker to perform XSS attacks.
The vulnerability is caused by an input validation error related to user uploads and the (default) LOCAL_UPLOADS_DIR storage backend. A remote attacker can create a specially specially crafted web page, trick the victim intop opening it and execute arbitrary HTML and script code in victim's browser.
MitigationInstall update from vendor's website.
Vulnerable software versionsZulip Server: 1.7.0 - 1.7.1
CPE2.3 External linkshttp://blog.zulip.org/2018/04/12/zulip-1-7-2-released/
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) Cross-site scripting
EUVDB-ID: #VU14656
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-2018-9990
CWE-ID:
CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Exploit availability: No
DescriptionVulnerability allows a remote attacker to perform XSS attacks.
The vulnerability is caused by an input validation error related to stream names in topic typeahead. A remote attacker can create a specially specially crafted web page, trick the victim intop opening it and execute arbitrary HTML and script code in victim's browser.
MitigationInstall update from vendor's website.
Vulnerable software versionsZulip Server: 1.7.0 - 1.7.1
CPE2.3 External linkshttp://blog.zulip.org/2018/04/12/zulip-1-7-2-released/
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) Cross-site scripting
EUVDB-ID: #VU14657
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-2018-9987
CWE-ID:
CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Exploit availability: No
DescriptionVulnerability allows a remote attacker to perform XSS attacks.
The vulnerability is caused by an input validation error related to muting notifications. A remote attacker can create a specially specially crafted web page, trick the victim intop opening it and execute arbitrary HTML and script code in victim's browser.
MitigationInstall update from vendor's website.
Vulnerable software versionsZulip Server: 1.7.0 - 1.7.1
CPE2.3 External linkshttp://blog.zulip.org/2018/04/12/zulip-1-7-2-released/
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) Cross-site scripting
EUVDB-ID: #VU14658
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-2018-9986
CWE-ID:
CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Exploit availability: No
DescriptionVulnerability allows a remote attacker to perform XSS attacks.
The vulnerability is caused by an input validation error related to the frontend markdown processor. A remote attacker can create a specially specially crafted web page, trick the victim intop opening it and execute arbitrary HTML and script code in victim's browser.
MitigationInstall update from vendor's website.
Vulnerable software versionsZulip Server: 1.7.0 - 1.7.1
CPE2.3 External linkshttp://blog.zulip.org/2018/04/12/zulip-1-7-2-released/
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.
