Dnsmasq up to 2.82 DNSSEC rfc1035.c extract_name heap-based overflow

Summaryinfo

A vulnerability classified as critical was found in Dnsmasq up to 2.82. Affected by this vulnerability is the function extract_name of the file rfc1035.c of the component DNSSEC. Such manipulation leads to heap-based overflow. This vulnerability is documented as CVE-2020-25683. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Dnsmasq up to 2.82 (Domain Name Software) and classified as problematic. Affected by this issue is the function extract_name of the file rfc1035.c of the component DNSSEC. The manipulation with an unknown input leads to a heap-based overflow vulnerability. Using CWE to declare the problem leads to CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). Impacted is availability.

The weakness was released 01/20/2021. The advisory is shared for download at jsof-tech.com. This vulnerability is handled as CVE-2020-25683. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 236546 (Alibaba Cloud Linux 3 : 0009: dnsmasq (ALINUX3-SA-2021:0009)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 2.83 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (236546). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Domain Name Software

Name

• Dnsmasq

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7
• 2.8
• 2.9
• 2.10
• 2.11
• 2.12
• 2.13
• 2.14
• 2.15
• 2.16
• 2.17
• 2.18
• 2.19
• 2.20
• 2.21
• 2.22
• 2.23
• 2.24
• 2.25
• 2.26
• 2.27
• 2.28
• 2.29
• 2.30
• 2.31
• 2.32
• 2.33
• 2.34
• 2.35
• 2.36
• 2.37
• 2.38
• 2.39
• 2.40
• 2.41
• 2.42
• 2.43
• 2.44
• 2.45
• 2.46
• 2.47
• 2.48
• 2.49
• 2.50
• 2.51
• 2.52
• 2.53
• 2.54
• 2.55
• 2.56
• 2.57
• 2.58
• 2.59
• 2.60
• 2.61
• 2.62
• 2.63
• 2.64
• 2.65
• 2.66
• 2.67
• 2.68
• 2.69
• 2.70
• 2.71
• 2.72
• 2.73
• 2.74
• 2.75
• 2.76
• 2.77
• 2.78
• 2.79
• 2.80
• 2.81
• 2.82

License

• open-source

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Once again VulDB remains the best source for vulnerability data.

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