Discount 2.2.3a markdown.c isfootnote Markdown memory corruption

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.3$0-$5k0.00

Summaryinfo

A vulnerability has been found in Discount 2.2.3a and classified as critical. Affected by this vulnerability is the function isfootnote of the file markdown.c. This manipulation as part of Markdown causes memory corruption. This vulnerability is handled as CVE-2018-11503. The attack can be initiated remotely. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as critical was found in Discount 2.2.3a. Affected by this vulnerability is the function isfootnote of the file markdown.c. The manipulation as part of a Markdown leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

The isfootnote function in markdown.c in libmarkdown.a in DISCOUNT 2.2.3a allows remote attackers to cause a denial of service (heap-based buffer over-read) via a crafted file, as demonstrated by mkd2html.

The bug was discovered 05/23/2018. The weakness was released 05/26/2018 (Website). The advisory is shared at github.com. This vulnerability is known as CVE-2018-11503 since 05/26/2018. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 3 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 117503 (Debian DSA-4293-1 : discount - security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l.

Upgrading eliminates this vulnerability. A possible mitigation has been published 4 months after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (117503). Entries connected to this vulnerability are available at VDB-118219, VDB-118262 and VDB-119606. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 117503
Nessus Name: Debian DSA-4293-1 : discount - security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Timelineinfo

05/23/2018 🔍
05/26/2018 +2 days 🔍
05/26/2018 +0 days 🔍
05/26/2018 +0 days 🔍
05/27/2018 +1 days 🔍
09/14/2018 +110 days 🔍
09/17/2018 +3 days 🔍
03/17/2023 +1642 days 🔍

Sourcesinfo

Advisory: 189
Status: Not defined

CVE: CVE-2018-11503 (🔍)
GCVE (CVE): GCVE-0-2018-11503
GCVE (VulDB): GCVE-100-118261

OVAL: 🔍
See also: 🔍

Entryinfo

Created: 05/27/2018 11:16
Updated: 03/17/2023 11:42
Changes: 05/27/2018 11:16 (71), 02/09/2020 09:00 (3), 03/17/2023 11:35 (4), 03/17/2023 11:42 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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