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Adobe Flash Player fpb.tmp Privilege Escalation

Adobe Flash Player fpb.tmp Privilege Escalation
Posted Jul 13, 2016
Authored by Stefan Kanthak

The executable installers of Adobe Flash Player released on 2016-06-15 fixed CVE-2016-1014 in the second attempt, but another vulnerability remained allowing for fpb.tmp to be executed with elevated privileges.

tags | advisory
advisories | CVE-2016-1014, CVE-2016-4247
MD5 | 914d2ea4fe1758e698bc2c87116b127e

Adobe Flash Player fpb.tmp Privilege Escalation

Change Mirror Download
Hi @ll,

the executable installers of Flash Player released 2016-06-15
fixed CVE-2016-1014 in the second attempt, but another vulnerability
remained: they create(d) and use(d) UNSAFE temporary subdirectories
into which they copy/ied themselves and extract(ed) a file "fpb.tmp"
which they load(ed) and execute(d) later with elevated privileges.

An unprivileged user can/could overwrite both files between creation
and execution and gain elevation of privilege.

See <https://cwe.mitre.org/data/definitions/379.html> for this type
of well-known and well-documented vulnerability!


stay tuned
Stefan Kanthak


Timeline:
~~~~~~~~~

2016-03-12 initial report sent to Adobe PSIRT

2016-03-13 Adobe PSIRT acknowledges vulnerability and assigns
PSIRT-4904

2016-04-06 Adobe PSIRT informs about CVE assigned and upcoming
fix scheduled for release later that week

2016-04-17 notification sent to Adobe PSIRT: fix is incomplete,
vulnerability persists

2016-04-17 Adobe PSIRT acknowledges receipt of second report

2016-04-17 Adobe PSIRT acknowledges vulnerability ... again

2016-06-17 Adobe released fixed Flash Player (un)installers,
report for CVE-2016-1014 published

2016-06-17 new report sent to Adobe PSIRT: unsafe TEMP
directory allows escalation of privilege

2016-06-17 Adobe PSIRT acknowledges receipt

2016-06-17 Adobe PSIRT acknowledges vulnerability and assigns
PSIRT-5480

2016-07-10 Adobe PSIRT informs about CVE assigned and upcoming
fix scheduled for release later this week

2016-07-12 Adobe released fixed Flash Player (un)installers,
report for CVE-2016-4247 published

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