PT-2020-7650 · Musl Libc+1 · Musl Libc+1

Rich Felker · Published 2014-06-18 · Updated 2021-03-15 · CVE-2014-3484

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions musl libc versions 0.9.13 through 1.0.3 musl libc versions 1.1.x before 1.1.2

Description The issue is related to multiple stack-based buffer overflows in the dn expand function, which can be triggered by an invalid name length in a DNS response. This can allow remote attackers to have an unspecified impact or cause a denial of service (crash), related to an infinite loop with no output.

Recommendations For musl libc versions 0.9.13 through 1.0.3, update to version 1.0.4 or later. For musl libc versions 1.1.x before 1.1.2, update to version 1.1.2 or later. As a temporary workaround, consider restricting the use of the dn expand function in the network/dn expand.c file until a patch is available.

Exploit

Fix

DoS

Memory Corruption

Weakness Enumeration

CWE-787

Related Identifiers

CVE-2014-3484

MGASA-2014-0262

USN-4768-1

Affected Products

Ubuntu

Musl Libc

References · 22

• 🔥 https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/linux/local/glibc_realpath_priv_esc.rb · Exploit
• 🔥 https://github.com/0x00-0x00/CVE-2018-1000001 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2014-3484 · Security Note
• http://git.musl-libc.org/cgit/musl/commit/?id=b3d9e0b94ea73c68ef4169ec82c898ce59a4e30a · Patch
• http://seclists.org/oss-sec/2014/q2/495 · Patch
• https://ubuntu.com/security/CVE-2016-8859 · Vendor Advisory
• https://ubuntu.com/security/CVE-2017-15650 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2014-3484 · Security Note
• https://osv.dev/vulnerability/USN-4768-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2015-1817 · Vendor Advisory
• https://osv.dev/vulnerability/MGASA-2014-0262 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-4768-1 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2014-3484 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2014-3484 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2014-3484 · Vendor Advisory