log.c in Squid Analysis Report Generator (sarg) through 2.3.11 allows local privilege escalation. By default, it uses a fixed temporary directory /tmp/sarg. As the root user, sarg creates this directory or reuses an existing one in an insecure manner. An attacker can pre-create the directory, and place symlinks in it (after winning a /tmp/sarg/denied.int_unsort race condition). The outcome will be corrupted or newly created files in privileged file system locations.

References

• https://nvd.nist.gov/vuln/detail/CVE-2019-18932
• https://bugzilla.suse.com/show_bug.cgi?id=1150554
• https://seclists.org/oss-sec/2020/q1/23
• https://security.gentoo.org/glsa/202007-32
• http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00051.html
• http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00063.html
• http://www.openwall.com/lists/oss-security/2020/01/20/6
• http://www.openwall.com/lists/oss-security/2020/01/27/1
• https://sourceforge.net/projects/sarg