CVE-2020-11491

published 2020-04-02

CVE-2020-11491: Monitoring::Logs in Zen Load Balancer 3.10.1 allows remote authenticated admins to conduct absolute path traversal attacks, as demonstrated by a…

Priority P3 38 medium 4.9 CVSS 3.1

AV N AC L PR H UI N S U C H I N A N

EXPLOIT

Monitoring::Logs in Zen Load Balancer 3.10.1 allows remote authenticated admins to conduct absolute path traversal attacks, as demonstrated by a filelog=/etc/shadow request to index.cgi.

Affected

1 ranges

Vendor	Product	Version range	Fixed in
zevenet	zen_load_balancer	—	—

Detection & IOCs extracted from sources · hover to see the quote

path /index.cgi↗

command filelog=/etc/shadow↗

• → Monitor HTTP requests to index.cgi containing a 'filelog=' parameter with absolute paths (e.g., starting with '/') — this is the exploited parameter for path traversal in Zen Load Balancer 3.10.1. ↗
• → Alert on requests to index.cgi where 'filelog=' references sensitive system files such as /etc/shadow, /etc/passwd, or other absolute paths outside the intended log directory. ↗
• → The vulnerability is reachable only by authenticated admin users; correlate suspicious traversal attempts with admin session activity in Zen Load Balancer's Monitoring::Logs interface. ↗

• · The vulnerability is specific to Zen Load Balancer version 3.10.1; other versions may not be affected. ↗

CVSS provenance

nvd v3.1 4.9 MEDIUM CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

nvd v2.0 4.0 MEDIUM AV:N/AC:L/Au:S/C:P/I:N/A:N

CVEs like this are exactly what “Exploited This Week” covers.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.

CWE-22