7.5
HIGH
CVE-2023-31137
MaraDNS Denial of Service Vulnerability
Description

MaraDNS is open-source software that implements the Domain Name System (DNS). In version 3.5.0024 and prior, a remotely exploitable integer underflow vulnerability in the DNS packet decompression function allows an attacker to cause a Denial of Service by triggering an abnormal program termination. The vulnerability exists in the `decomp_get_rddata` function within the `Decompress.c` file. When handling a DNS packet with an Answer RR of qtype 16 (TXT record) and any qclass, if the `rdlength` is smaller than `rdata`, the result of the line `Decompress.c:886` is a negative number `len = rdlength - total;`. This value is then passed to the `decomp_append_bytes` function without proper validation, causing the program to attempt to allocate a massive chunk of memory that is impossible to allocate. Consequently, the program exits with an error code of 64, causing a Denial of Service. One proposed fix for this vulnerability is to patch `Decompress.c:887` by breaking `if(len <= 0)`, which has been incorporated in version 3.5.0036 via commit bab062bde40b2ae8a91eecd522e84d8b993bab58.

INFO

Published Date :

May 9, 2023, 2:15 p.m.

Last Modified :

March 7, 2024, 7:56 p.m.

Remotely Exploitable :

Yes !

Impact Score :

3.6

Exploitability Score :

3.9
Affected Products

The following products are affected by CVE-2023-31137 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Fedoraproject fedora
1 Debian debian_linux
1 Maradns maradns

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2023-31137 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2023-31137 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • Modified Analysis by [email protected]

    Mar. 07, 2024

    Action Type Old Value New Value
    Changed Reference Type https://lists.debian.org/debian-lts-announce/2023/06/msg00019.html No Types Assigned https://lists.debian.org/debian-lts-announce/2023/06/msg00019.html Mailing List, Third Party Advisory
    Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/3VSMLJX25MXGQ6A7UPOGK7VPUVDESPHL/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/3VSMLJX25MXGQ6A7UPOGK7VPUVDESPHL/ Mailing List, Third Party Advisory
    Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/NB7LDZM5AGWC5BHHQHW6CP5OFNBBKFOQ/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/NB7LDZM5AGWC5BHHQHW6CP5OFNBBKFOQ/ Mailing List, Third Party Advisory
    Changed Reference Type https://www.debian.org/security/2023/dsa-5441 No Types Assigned https://www.debian.org/security/2023/dsa-5441 Mailing List, Third Party Advisory
    Changed CPE Configuration OR *cpe:2.3:a:maradns:maradns:*:*:*:*:*:*:*:* versions up to (including) 3.5.0024 OR *cpe:2.3:a:maradns:maradns:*:*:*:*:*:*:*:* versions up to (excluding) 3.4.10 *cpe:2.3:a:maradns:maradns:*:*:*:*:*:*:*:* versions from (including) 3.5.0001 up to (excluding) 3.5.0036
    Added CPE Configuration OR *cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:* *cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:*
    Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* *cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
  • CVE Modified by [email protected]

    Jun. 29, 2023

    Action Type Old Value New Value
    Added Reference https://www.debian.org/security/2023/dsa-5441 [No Types Assigned]
  • CVE Modified by [email protected]

    Jun. 19, 2023

    Action Type Old Value New Value
    Added Reference https://lists.debian.org/debian-lts-announce/2023/06/msg00019.html [No Types Assigned]
  • CVE Modified by [email protected]

    May. 25, 2023

    Action Type Old Value New Value
    Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/NB7LDZM5AGWC5BHHQHW6CP5OFNBBKFOQ/ [No Types Assigned]
    Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/3VSMLJX25MXGQ6A7UPOGK7VPUVDESPHL/ [No Types Assigned]
  • Initial Analysis by [email protected]

    May. 16, 2023

    Action Type Old Value New Value
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    Changed Reference Type https://github.com/samboy/MaraDNS/blob/08b21ea20d80cedcb74aa8f14979ec7c61846663/dns/Decompress.c#L886 No Types Assigned https://github.com/samboy/MaraDNS/blob/08b21ea20d80cedcb74aa8f14979ec7c61846663/dns/Decompress.c#L886 Product
    Changed Reference Type https://github.com/samboy/MaraDNS/commit/bab062bde40b2ae8a91eecd522e84d8b993bab58 No Types Assigned https://github.com/samboy/MaraDNS/commit/bab062bde40b2ae8a91eecd522e84d8b993bab58 Patch
    Changed Reference Type https://github.com/samboy/MaraDNS/security/advisories/GHSA-58m7-826v-9c3c No Types Assigned https://github.com/samboy/MaraDNS/security/advisories/GHSA-58m7-826v-9c3c Vendor Advisory
    Added CPE Configuration OR *cpe:2.3:a:maradns:maradns:*:*:*:*:*:*:*:* versions up to (including) 3.5.0024
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2023-31137 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2023-31137 weaknesses.

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.18 }} 0.03%

score

0.55302

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability