PT-2021-17726 · Ossec · Ossec

Lockedbyte · Published 2021-03-05 · Updated 2021-03-09 · CVE-2021-28040

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions: OSSEC version 3.6.0

Description: An issue was discovered in the os xml.c component, where an uncontrolled recursion vulnerability occurs when a large number of opening and closing XML tags is used. This happens because recursion is used in the ReadElem function without restriction, allowing an attacker to trigger a segmentation fault once unmapped memory is reached.

Recommendations: For OSSEC version 3.6.0, consider restricting the use of the ReadElem function in os xml.c to prevent uncontrolled recursion until a patch is available. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Uncontrolled Recursion

Weakness Enumeration

CWE-674

Related Identifiers

CVE-2021-28040

Affected Products

Ossec

References · 4

• 🔥 https://github.com/ossec/ossec-hids/issues/1953 · Exploit
• https://osv.dev/vulnerability/CVE-2021-28040 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-28040 · Security Note
• https://t.me/cibsecurity/24534 · Telegram Post