PT-2021-5835 · Md4C+1 · Md4C+1

Bsdboy · Published 2021-04-29 · Updated 2021-05-09 · CVE-2021-30027

Positive Technologies (AI Summary)

CVSS v2.0

7.1

High

Base vector

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

Name of the Vulnerable Software and Affected Versions md4c version 0.4.7

Description The issue is related to the md analyze line function in md4c.c, which allows attackers to trigger the use of uninitialized memory. This can cause a denial of service via a malformed Markdown document. The vulnerability can be exploited by a remote attacker to disrupt service.

Recommendations For md4c version 0.4.7, consider disabling the md analyze line function in md4c.c until a patch is available to prevent the use of uninitialized memory and potential denial of service attacks. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

DoS

Use of Uninitialized Resource

Weakness Enumeration

CWE-908

Related Identifiers

BDU:2022-00345

CVE-2021-30027

Affected Products

Astra Linux

Md4C

References · 12

• 🔥 https://github.com/mity/md4c/issues/155 · Exploit
• https://github.com/mity/md4c/commit/4fc808d8fe8d8904f8525bb4231d854f45e23a19 · Patch
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-30027 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-30027 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2021-30027 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2021-30027 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-30027 · Vendor Advisory
• https://bdu.fstec.ru/vul/2022-00345 · Security Note
• https://wiki.astralinux.ru/astra-linux-se17-bulletin-2021-1126SE17 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-30027 · Security Note
• https://wiki.astralinux.ru/astra-linux-se47-bulletin-2022-0114SE47 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-30027 · Vendor Advisory