#VU54559 Double Free in Glibc - CVE-2021-27645
Vulnerability identifier: #VU54559
Vulnerability risk: Low
CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID:
CWE-ID:
CWE-415
Exploitation vector: Local
Exploit availability: No
Vulnerable software:
Glibc
Universal components / Libraries /
Libraries used by multiple products
Vendor: GNU
Description
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary error within the nameserver caching daemon (nscd) in the GNU C Library when processing a request for netgroup lookup. A local user can initiate a specially crafted request, trigger a double free error and perform a denial of service (DoS) attack.
Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.
Vulnerable software versions
Glibc: 2.29.9000 - 2.33.9000
External links
https://sourceware.org/bugzilla/show_bug.cgi?id=27462
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/I7TS26LIZSOBLGJEZMJX4PXT5BQDE2WS/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/7LZNT6KTMCCWPWXEOGSHD3YLYZKUGMH5/
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
