High [CVE-2020-1752] use-after-free vulnerability introduced in glibc upstream version 2.14 was found in the way the tilde expansion was carried out
This high-severity Red Hat Linux advisory covers CVE-2020-1752 affecting Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 7, Red Hat package: glibc.
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Summary
A use-after-free vulnerability introduced in glibc upstream version 2.14 was found in the way the tilde expansion was carried out. Directory paths containing an initial tilde followed by a valid username were affected by this issue.
A local attacker could exploit this flaw by creating a specially crafted path that, when processed by the glob function, would potentially lead to arbitrary code execution. This was fixed in version 2.32.
The Red Hat Product Security Team has rated this issue as having Moderate security impact. This flaw did not affect the versions of `glibc` as shipped with Red Hat Enterprise Linux 5 and 6, as the vulnerable code was introduced in a later version of the package.
Red Hat Enterprise Linux 7 is approaching the End of Maintenance Support 1 Phase of the support and maintenance life cycle. The flaw is not currently planned to be addressed in future updates of Red Hat Enterprise Linux 7, hence marked as "Will not fix".
Red Hat severity: Moderate — CVSS 7 (CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H). Weakness: CWE-416.
Affected Red Hat products: Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 7. Red Hat fixing advisory: RHSA-2020:4444.
Affected products named by the advisory: Red Hat package: glibc.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 15 hours ago·verify at source
- 2.32
- glibc-0:2.28-127.el8
- RHSA-2020:4444
Official advisory · high-confidence parse· fetched 15 hours ago·verify at source
Mitigation checklist
- Avoid the expansion of overly long directory paths.
Official advisory · high-confidence parse· fetched 15 hours ago·verify at source
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