VulnerabilityModified
CVE-2021-3999
An off-by-one buffer overflow and underflow in getcwd() may lead to memory corruption when the size of the buffer is exactly 1.
HIGH 7.8EPSS 0.75%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.75%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
A flaw was found in glibc. An off-by-one buffer overflow and underflow in getcwd() may lead to memory corruption when the size of the buffer is exactly 1. A local attacker who can control the input buffer and size passed to getcwd() in a setuid program could use this flaw to potentially execute arbitrary code and escalate their privileges on the system.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.75% probability · 53th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-193
- Affected
- gnu/glibc · debian/debian linux · netapp/e-series performance analyzer · netapp/nfs plug-in · netapp/ontap select deploy administration utility · netapp/h300s firmware · netapp/h500s firmware · netapp/h700s firmware · netapp/h410s firmware · netapp/h410c firmware
- Source
- secalert@redhat.com
References
- https://access.redhat.com/security/cve/CVE-2021-3999Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2024637Issue Tracking, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/10/msg00021.htmlMailing List, Third Party Advisory
- https://security-tracker.debian.org/tracker/CVE-2021-3999Third Party Advisory
- https://security.netapp.com/advisory/ntap-20221104-0001/Third Party Advisory
- https://sourceware.org/bugzilla/show_bug.cgi?id=28769Issue Tracking, Third Party Advisory
- https://sourceware.org/git/gitweb.cgi?p=glibc.git%3Bh=23e0e8f5f1fb5ed150253d986ecccdc90c2dcd5e
- https://www.openwall.com/lists/oss-security/2022/01/24/4Exploit, Mailing List, Third Party Advisory
- https://access.redhat.com/security/cve/CVE-2021-3999Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2024637Issue Tracking, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/10/msg00021.htmlMailing List, Third Party Advisory
- https://security-tracker.debian.org/tracker/CVE-2021-3999Third Party Advisory
- https://security.netapp.com/advisory/ntap-20221104-0001/Third Party Advisory
- https://sourceware.org/bugzilla/show_bug.cgi?id=28769Issue Tracking, Third Party Advisory
- https://sourceware.org/git/gitweb.cgi?p=glibc.git%3Bh=23e0e8f5f1fb5ed150253d986ecccdc90c2dcd5e
- https://www.openwall.com/lists/oss-security/2022/01/24/4Exploit, Mailing List, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.