#VU16961 Out-of-bounds read in DISCOUNT - CVE-2018-12495

Vulnerability identifier: #VU16961

Vulnerability risk: Low

CVSSv4.0: 4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-12495

CWE-ID: CWE-125

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
DISCOUNT
Client/Desktop applications / Other client software

Vendor: John Gruber

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to heap-based buffer over-read in the quoteblock function in markdown.c in libmarkdown.a. A remote attacker can perform a denial of service via a specially crafted file.

Mitigation
Install update from vendor's website.

Vulnerable software versions

DISCOUNT: 2.2.3a

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External links
https://github.com/Orc/discount/issues/189#issuecomment-397541501

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.