HylaFAX+ through 7.0.2 and HylaFAX Enterprise have scripts that execute binaries from directories writable by unprivileged users (e.g., locations under /var/spool/hylafax that are writable by the uucp account). This allows these users to execute code in the context of the user calling these binaries (often root).

In HylaFAX+ through 7.0.2 and HylaFAX Enterprise, the faxsetup utility calls chown on files in user-owned directories. By winning a race, a local attacker could use this to escalate his privileges to root.

A Incorrect Default Permissions vulnerability in the packaging of hylafax+ of openSUSE Leap 15.2, openSUSE Leap 15.1, openSUSE Factory allows local attackers to escalate from user uucp to users calling hylafax binaries. This issue affects: openSUSE Leap 15.2 hylafax+ versions prior to 7.0.2-lp152.2.1. openSUSE Leap 15.1 hylafax+ version 5.6.1-lp151.3.7 and prior versions. openSUSE Factory hylafax+ versions prior to 7.0.2-2.1.

sendfax.php in iFAX AvantFAX before 3.3.6 and HylaFAX Enterprise Web Interface before 0.2.5 allows authenticated Command Injection.

HylaFAX 6.0.6 and HylaFAX+ 5.6.0 allow remote attackers to execute arbitrary code via a dial-in session that provides a FAX page with the JPEG bit enabled, which is mishandled in FaxModem::writeECMData() in the faxd/CopyQuality.c++ file.

Heap-based buffer overflow in hfaxd in HylaFAX+ 5.2.4 through 5.5.3, when using LDAP authentication, might allow remote attackers to cause a denial of service (child hang) or execute arbitrary code via a long USER command.

c2faxrecv in capi4hylafax 01.02.03 allows remote attackers to execute arbitrary commands via null (\0) and shell metacharacters in the TSI string, as demonstrated by a fax from an anonymous number.

CAPI4HylaFAX 1.3, when compiled with GENERATE_DEBUGSFFDATAFILE set, allows local users to modify arbitrary files via a symlink attack on the c2faxrecv_dbgdatafile.sff temporary file.

hfaxd in HylaFAX 4.2.3, when PAM support is disabled, accepts arbitrary passwords, which allows remote attackers to gain privileges.

Multiple eval injection vulnerabilities in HylaFAX 4.2.3 and earlier allow remote attackers to execute arbitrary commands via (1) the notify script in HylaFAX 4.2.0 to 4.2.3 and (2) crafted CallID parameters to the faxrcvd script in HylaFAX 4.2.2 and 4.2.3.