PT-2021-3848 · Tcexam · Tcexam

Derrie Sutton · Published 2021-07-15 · Updated 2021-08-02 · CVE-2021-20112

Positive Technologies (AI Summary)

CVSS v3.1

5.4

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions TCExam versions prior to 14.8.1

Description The issue is related to incorrect rendering of files as text/html when they start with a period. This can lead to cross-site scripting attacks. An attacker could upload a malicious JavaScript payload via the tce select mediafile.php endpoint, which would be triggered when another user views the file. The estimated number of potentially affected devices is not specified.

Recommendations For versions prior to 14.8.1, update to a version that includes the fix for this issue to prevent exploitation. As a temporary workaround, consider restricting access to the tce select mediafile.php endpoint to minimize the risk of uploading malicious files.

Exploit

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

BDU:2021-04203

CVE-2021-20112

Affected Products

Tcexam

References · 5

• 🔥 https://tenable.com/security/research/tra-2021-32 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2021-20112 · Security Note
• https://osv.dev/vulnerability/CVE-2021-20112 · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-04203 · Security Note
• https://github.com/tecnickcom/tcexam/commit/99ee2e02849c6285c5b9f18f31a1b5938d97191b · Note