CVE-2019-18183: pacman before 5.2 is vulnerable to arbitrary command injection in lib/libalpm/sync.c in the apply_deltas() function. This can be exploited when unsigned…

PriorityP259critical9.8CVSS 3.1

AVNACLPRNUINSUCHIHAH

EPSS

3.67%

88.3th percentile

pacman before 5.2 is vulnerable to arbitrary command injection in lib/libalpm/sync.c in the apply_deltas() function. This can be exploited when unsigned databases are used. To exploit the vulnerability, the user must enable the non-default delta feature and retrieve an attacker-controlled crafted database and delta file.

Affected

4 ranges

Vendor	Product	Version range	Fixed in
fedoraproject	fedora	—	—
fedoraproject	fedora	—	—
fedoraproject	fedora	—	—
pacman_project	pacman	< 5.2	5.2

Detection & IOCsextracted from sources · hover to see the quote

→Vulnerable code is located in lib/libalpm/sync.c within the apply_deltas() function — monitor for command injection attempts targeting this code path in pacman versions before 5.2 ↗
→Exploitation requires the delta feature to be enabled (non-default) and an attacker-controlled database and delta file to be retrieved — alert on pacman delta feature usage combined with unsigned database configurations ↗

·Exploitation is only possible when unsigned databases are in use — systems enforcing database signature verification are not exploitable via this vector ↗
·The delta feature is non-default; exploitation requires the user to have explicitly enabled it in their pacman configuration ↗

CVSS provenance

nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvdv2.06.8MEDIUMAV:N/AC:M/Au:N/C:P/I:P/A:P

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