PT-2021-3967 · Tencent · Tencentos-Tiny

Published 2021-04-29 · Updated 2022-05-12 · CVE-2021-27439

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

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

Name of the Vulnerable Software and Affected Versions TencentOS-tiny version 3.1.0

Description The issue is related to an integer overflow in the tos mmheap alloc function of the TencentOS real-time operating system. This can lead to improper memory allocation, resulting in unexpected behavior such as a crash or remote code injection/execution. The vulnerability can be exploited by a remote attacker to execute arbitrary code.

Recommendations For TencentOS-tiny version 3.1.0, consider disabling the tos mmheap alloc function as a temporary workaround until a patch is available. Restrict access to the vulnerable function to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Integer Overflow

Weakness Enumeration

CWE-190

Related Identifiers

BDU:2021-04486

CVE-2021-27439

Affected Products

Tencentos-Tiny

References · 11

• https://osv.dev/vulnerability/CVE-2021-27439 · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-04486 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-27439 · Security Note
• https://github.com/OpenAtomFoundation/TencentOS-tiny/blob/master/README_en.md · Note
• https://cert.civis.net/en/index.php?action=alert&param=CVE-2021-27439 · Note
• https://exchange.xforce.ibmcloud.com/vulnerabilities/201016 · Note
• https://t.me/cvenotify/30086 · Telegram Post
• https://us-cert.cisa.gov/ics/advisories/icsa-21-119-04 · Note
• https://cisa.gov/uscert/ics/advisories/icsa-21-119-04 · Note
• https://t.me/cibsecurity/41859 · Telegram Post
• https://cert.civis.net/en/index.php?action=alert&param=CVE-2021-27439 · Note