musl Libc up to 1.1.16 DNS Reply network/lookup_name.c memory corruption

Summaryinfo

A vulnerability was found in musl Libc up to 1.1.16 and classified as critical. Affected is an unknown function of the file network/lookup_name.c of the component DNS Reply Handler. The manipulation results in memory corruption. This vulnerability is cataloged as CVE-2017-15650. The attack may be launched remotely. There is no exploit available. It is best practice to apply a patch to resolve this issue.

Detailsinfo

A vulnerability was found in musl Libc up to 1.1.16. It has been classified as critical. Affected is an unknown code of the file network/lookup_name.c of the component DNS Reply Handler. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

musl libc before 1.1.17 has a buffer overflow via crafted DNS replies because dns_parse_callback in network/lookup_name.c does not restrict the number of addresses, and thus an attacker can provide an unexpected number by sending A records in a reply to an AAAA query.

The bug was discovered 10/19/2017. The weakness was shared 10/19/2017 as confirmed git commit (GIT Repository). The advisory is available at git.musl-libc.org. This vulnerability is traded as CVE-2017-15650 since 10/19/2017. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit.

Upgrading to version 1.1.17 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.musl-libc.org. The best possible mitigation is suggested to be patching the affected component.

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Productinfo

Vendor

• musl

Name

• Libc

Version

• 1.1.0
• 1.1.1
• 1.1.2
• 1.1.3
• 1.1.4
• 1.1.5
• 1.1.6
• 1.1.7
• 1.1.8
• 1.1.9
• 1.1.10
• 1.1.11
• 1.1.12
• 1.1.13
• 1.1.14
• 1.1.15
• 1.1.16

CPE 2.3info

• 🔍
• 🔍
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CPE 2.2info

• 🔍
• 🔍
• 🔍

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