[SECURITY] [DLA 4092-1] libcap2 security update
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Debian LTS Advisory DLA-4092-1 debian-lts@lists.debian.org
https://www.debian.org/lts/security/ Chris Lamb
March 26, 2025 https://wiki.debian.org/LTS
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Package : libcap2
Version : 1:2.44-1+deb11u1
CVE IDs : CVE-2023-2602 CVE-2023-2603 CVE-2025-1390
Debian Bugs : 1036114 1098318
It was discovered that there were three issues in libcap2, a library
for managing kernel "capabilities"; that is, partitioning the
powerful single "root" privilege into a set of distinct privileges,
typically used to limit any damage if a process running as the "root"
user is exploited. The three issues are as follows:
* CVE-2023-2602: A vulnerability was found in the pthread_create()
function. This issue could have allowed a malicious actor in order
to exhaust the system's memory.
* CVE-2023-2603: An issue was found in the _libcap_strdup function
which could have led to an integer overflow if the input string was
close to 4GiB.
* CVE-2025-1390: The pam_cap.so PAM module supports group names
starting with "@" but during parsing, configurations not starting
with "@" were incorrectly recognised as group names. This
user-group confusion may have resulted in unintended users being
granted an inherited capability set, potentially leading to
security risks. Attackers could have exploited this vulnerability
to achieve local privilege escalation on systems where
capability.conf was used to configure user inherited privileges by
constructing specific usernames.
For Debian 11 bullseye, these problems have been fixed in version
1:2.44-1+deb11u1.
We recommend that you upgrade your libcap2 packages.
For the detailed security status of libcap2 please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/libcap2
Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
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