PT-2021-3936 · Unknown · Exponent Cms

Dumpling-Soup · Published 2021-08-10 · Updated 2021-08-23 · CVE-2021-38751

Positive Technologies (AI Summary)

CVSS v2.0

4.3

Medium

Base vector

AV:N/AC:M/Au:N/C:N/I:P/A:N

Name of the Vulnerable Software and Affected Versions ExponentCMS versions 2.6 and below

Description A HTTP Host header attack exists in ExponentCMS, allowing a modified HTTP header to change links on the webpage to an arbitrary value. This can lead to a possible attack vector for Man-in-the-Middle (MITM) attacks. The issue is related to a lack of output encoding or escaping mechanism in the system, which can be exploited by a remote attacker to impact the integrity of protected information by modifying the HTTP header.

Recommendations For ExponentCMS versions 2.6 and below, consider disabling access to the /exponent constants.php file until a patch is available. As a temporary workaround, restrict the modification of HTTP headers to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Improper Encoding or Escaping of Output

Weakness Enumeration

CWE-116

Related Identifiers

BDU:2021-04453

CVE-2021-38751

Affected Products

Exponent Cms

References · 7

• 🔥 https://github.com/exponentcms/exponent-cms/issues/1544 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2021-38751 · Security Note
• https://osv.dev/vulnerability/CVE-2021-38751 · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-04453 · Security Note
• https://t.me/cibsecurity/27385 · Telegram Post
• https://t.me/cvenotify/19429 · Telegram Post
• https://t.me/cvenotify/19447 · Telegram Post