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.
Analysis
Analysis and contextual insights are available on OpenCVE Cloud.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| samboy | MaraDNS | affected |
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Configuration 1 [-]
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Configuration 2 [-]
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Configuration 3 [-]
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No data.
No data available yet.
No vendor fix or workaround currently provided.
Additional remediation guidance may be available on OpenCVE Cloud.
Tracking
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| Source | ID | Title |
|---|---|---|
 Debian DLA |
DLA-3457-1 | maradns security update |
 Debian DSA |
DSA-5441-1 | maradns security update |
 EUVD |
EUVD-2023-35457 | 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. |
 Ubuntu USN |
USN-6271-1 | MaraDNS vulnerabilities |
Wed, 27 Nov 2024 17:15:00 +0000
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ssvc
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MITRE
Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2025-02-13T16:49:46.296Z
Reserved: 2023-04-24T21:44:10.417Z
Link: CVE-2023-31137
Vulnrichment
Updated: 2024-08-02T14:45:25.771Z
NVD
Status : Modified
Published: 2023-05-09T14:15:13.607
Modified: 2024-11-21T08:01:28.183
Link: CVE-2023-31137
Redhat
No data.
OpenCVE Enrichment
No data.