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AUSCERT External Security Bulletin Redistribution
ESB-2018.2686
Multiple PCRE vulnerabilities
10 September 2018
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Big-IP
Big-IQ
Enterprise Manager
LineRate
Traffix SDC
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Access Privileged Data -- Remote/Unauthenticated
Modify Arbitrary Files -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2015-8395 CVE-2015-8394 CVE-2015-8392
CVE-2015-8391 CVE-2015-8390 CVE-2015-8389
CVE-2015-8388 CVE-2015-8387 CVE-2015-8386
CVE-2015-8385 CVE-2015-8384 CVE-2015-8383
CVE-2015-8382 CVE-2015-8381 CVE-2015-8380
CVE-2015-3217 CVE-2015-2328 CVE-2015-2327
Reference: ASB-2016.0072
ASB-2016.0024
ESB-2016.0255
ESB-2015.2365.2
Original Bulletin:
https://support.f5.com/csp/article/K20225390
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K20225390: Multiple PCRE vulnerabilities
Security Advisory
Original Publication Date: Feb 05, 2016
Updated Date: Sep 06, 2018
Applies to (see versions):
o Product: BIG-IQ
- 4.X.X
o Product: BIG-IP
- 13.1.0, 13.0.1, 13.0.0, 12.1.3, 12.1.2, 12.1.1, 12.1.0, 12.0.0, 11.6.3,
11.6.2, 11.6.1, 11.6.0, 11.5.6, 11.5.5, 11.5.4, 11.5.3, 11.5.2, 11.5.1,
11.5.0, 11.4.1, 11.4.0, 11.3.0, 11.2.1, 11.2.0, 11.1.0, 11.0.0, 10.2.X,
10.1.X
o Product: F5 Silverline
- 1.X.X
o Product: Enterprise Manager
- 3.X.X
o Product: F5 MobileSafe
- 1.X.X
o Product: F5 WebSafe
- 1.X.X
o Product: Traffix SDC
- 4.X.X, 3.X.X
o Product: Legacy Products, FirePass, LineRate
- 7.X.X, 6.1.X, 6.0.X, 2.X.X
Security Advisory Description
o CVE-2015-8395
PCRE before 8.38 mishandles certain references, which allows remote
attackers to cause a denial of service or possibly have unspecified other
impact via a crafted regular expression, as demonstrated by a JavaScript
RegExp object encountered by Konqueror, a related issue to CVE-2015-8384
and CVE-2015-8392.
o CVE-2015-8394
PCRE before 8.38 mishandles the (?() and (?(R) conditions, which allows
remote attackers to cause a denial of service (integer overflow) or
possibly have unspecified other impact via a crafted regular expression, as
demonstrated by a JavaScript RegExp object encountered by Konqueror.
o CVE-2015-8392
PCRE before 8.38 mishandles certain instances of the (?| substring, which
allows remote attackers to cause a denial of service (unintended recursion
and buffer overflow) or possibly have unspecified other impact via a
crafted regular expression, as demonstrated by a JavaScript RegExp object
encountered by Konqueror, a related issue to CVE-2015-8384 and
CVE-2015-8395.
o CVE-2015-8391
The pcre_compile function in pcre_compile.c in PCRE before 8.38 mishandles
certain [: nesting, which allows remote attackers to cause a denial of
service (CPU consumption) or possibly have unspecified other impact via a
crafted regular expression, as demonstrated by a JavaScript RegExp object
encountered by Konqueror.
o CVE-2015-8390
PCRE before 8.38 mishandles the [: and \\ substrings in character classes,
which allows remote attackers to cause a denial of service (uninitialized
memory read) or possibly have unspecified other impact via a crafted
regular expression, as demonstrated by a JavaScript RegExp object
encountered by Konqueror.
o CVE-2015-8389
PCRE before 8.38 mishandles the /(?:|a|){100}x/ pattern and related
patterns, which allows remote attackers to cause a denial of service
(infinite recursion) or possibly have unspecified other impact via a
crafted regular expression, as demonstrated by a JavaScript RegExp object
encountered by Konqueror.
o CVE-2015-8388
PCRE before 8.38 mishandles the /(?=di(?<=(?1))|(?=(.))))/ pattern and
related patterns with an unmatched closing parenthesis, which allows remote
attackers to cause a denial of service (buffer overflow) or possibly have
unspecified other impact via a crafted regular expression, as demonstrated
by a JavaScript RegExp object encountered by Konqueror.
o CVE-2015-8387
PCRE before 8.38 mishandles (?123) subroutine calls and related subroutine
calls, which allows remote attackers to cause a denial of service (integer
overflow) or possibly have unspecified other impact via a crafted regular
expression, as demonstrated by a JavaScript RegExp object encountered by
Konqueror.
o CVE-2015-8386
PCRE before 8.38 mishandles the interaction of lookbehind assertions and
mutually recursive subpatterns, which allows remote attackers to cause a
denial of service (buffer overflow) or possibly have unspecified other
impact via a crafted regular expression, as demonstrated by a JavaScript
RegExp object encountered by Konqueror.
o CVE-2015-8385
PCRE before 8.38 mishandles the /(?|(\k'Pm')|(?'Pm'))/ pattern and related
patterns with certain forward references, which allows remote attackers to
cause a denial of service (buffer overflow) or possibly have unspecified
other impact via a crafted regular expression, as demonstrated by a
JavaScript RegExp object encountered by Konqueror.
o CVE-2015-8384
PCRE before 8.38 mishandles the /(?J)(?'d'(?'d'\g{d}))/ pattern and related
patterns with certain recursive back references, which allows remote
attackers to cause a denial of service (buffer overflow) or possibly have
unspecified other impact via a crafted regular expression, as demonstrated
by a JavaScript RegExp object encountered by Konqueror, a related issue to
CVE-2015-8392 and CVE-2015-8395.
o CVE-2015-8383
PCRE before 8.38 mishandles certain repeated conditional groups, which
allows remote attackers to cause a denial of service (buffer overflow) or
possibly have unspecified other impact via a crafted regular expression, as
demonstrated by a JavaScript RegExp object encountered by Konqueror.
o CVE-2015-8382
The match function in pcre_exec.c in PCRE before 8.37 mishandles the /(?:
((abcd))|(((?:(?:(?:(?:abc|(?:abcdef))))b)abcdefghi)abc)|((*ACCEPT)))/
pattern and related patterns involving (*ACCEPT), which allows remote
attackers to obtain sensitive information from process memory or cause a
denial of service (partially initialized memory and application crash) via
a crafted regular expression, as demonstrated by a JavaScript RegExp object
encountered by Konqueror, aka ZDI-CAN-2547.
o CVE-2015-8381
The compile_regex function in pcre_compile.c in PCRE before 8.38 and
pcre2_compile.c in PCRE2 before 10.2x mishandles the /(?J:(?|(:(?|(?'R')(\
k'R')|((?'R')))H'Rk'Rf)|s(?'R'))))/ and /(?J:(?|(:(?|(?'R')(\z(?|(?'R')(\
k'R')|((?'R')))k'R')|((?'R')))H'Ak'Rf)|s(?'R')))/ patterns, and related
patterns with certain group references, which allows remote attackers to
cause a denial of service (heap-based buffer overflow) or possibly have
unspecified other impact via a crafted regular expression, as demonstrated
by a JavaScript RegExp object encountered by Konqueror.
o CVE-2015-8380
The pcre_exec function in pcre_exec.c in PCRE before 8.38 mishandles a //
pattern with a \01 string, which allows remote attackers to cause a denial
of service (heap-based buffer overflow) or possibly have unspecified other
impact via a crafted regular expression, as demonstrated by a JavaScript
RegExp object encountered by Konqueror.
o CVE-2015-2328
PCRE before 8.36 mishandles the /((?(R)a|(?1)))+/ pattern and related
patterns with certain recursion, which allows remote attackers to cause a
denial of service (segmentation fault) or possibly have unspecified other
impact via a crafted regular expression, as demonstrated by a JavaScript
RegExp object encountered by Konqueror.
o CVE-2015-2327
PCRE before 8.36 mishandles the /(((a\2)|(a*)\g<-1>))*/ pattern and related
patterns with certain internal recursive back references, which allows
remote attackers to cause a denial of service (segmentation fault) or
possibly have unspecified other impact via a crafted regular expression, as
demonstrated by a JavaScript RegExp object encountered by Konqueror.
o CVE-2015-3217
PCRE 7.8 and 8.32 through 8.37, and PCRE2 10.10 mishandle group empty
matches, which might allow remote attackers to cause a denial of service
(stack-based buffer overflow) via a crafted regular expression, as
demonstrated by /^(?:(?(1)\\.|([^\\\\W_])?)+)+$/.
Impact
These vulnerabilities may allow remote attackers to cause a denial-of-service
(DoS) or possibly have unspecified other impact by way of a crafted regular
expression.
Important: When the BIG-IP ASM system is not provisioned, the attack vector
requires local user access and is considered a Low severity.
Security Advisory Status
F5 Product Development has assigned IDs 564111 and 565895 (BIG-IP), IDs 566040
and 566044 (BIG-IQ & Enterprise Manager), and ID 541509 (ARX) to this
vulnerability, and has evaluated the currently supported releases for potential
vulnerability. Additionally, BIG-IP iHealth may list Heuristic H570136 on the
Diagnostics > Identified > Low screen.
To determine if your release is known to be vulnerable, the components or
features that are affected by the vulnerability, and for information about
releases or hotfixes that address the vulnerability, refer to the following
table.
+---------------+----------------+-----------------+----------+----------------+
| |Versions known |Versions known to| |Vulnerable |
|Product |to be vulnerable|be not vulnerable|Severity |component or |
| | | | |feature |
+---------------+----------------+-----------------+----------+----------------+
| | |13.0.0 - 13.1.0 | | |
| |12.0.0 - 12.1.0 |12.1.1 - 12.1.3 | | |
|BIG-IP LTM |11.6.0 - 11.6.1 |11.6.1 HF1 - |Low |PCRE library |
| |11.0.0 - 11.5.4 |11.6.3 | | |
| |10.1.0 - 10.2.4 |11.5.4 HF2 - | | |
| | |11.5.6 | | |
+---------------+----------------+-----------------+----------+----------------+
| | |13.0.0 - 13.1.0 | | |
| |12.0.0 - 12.1.0 |12.1.1 - 12.1.3 | | |
|BIG-IP AAM |11.6.0 - 11.6.1 |11.6.1 HF1 - |Low |PCRE library |
| |11.4.0 - 11.5.4 |11.6.3 | | |
| | |11.5.4 HF2 - | | |
| | |11.5.6 | | |
+---------------+----------------+-----------------+----------+----------------+
| | |13.0.0 - 13.1.0 | | |
| |12.0.0 - 12.1.0 |12.1.1 - 12.1.3 | | |
|BIG-IP AFM |11.6.0 - 11.6.1 |11.6.1 HF1 - |Low |PCRE library |
| |11.3.0 - 11.5.4 |11.6.3 | | |
| | |11.5.4 HF2 - | | |
| | |11.5.6 | | |
+---------------+----------------+-----------------+----------+----------------+
| | |13.0.0 - 13.1.0 | | |
| |12.0.0 - 12.1.0 |12.1.1 - 12.1.3 | | |
|BIG-IP |11.6.0 - 11.6.1 |11.6.1 HF1 - |Low |PCRE library |
|Analytics |11.0.0 - 11.5.4 |11.6.3 | | |
| | |11.5.4 HF2 - | | |
| | |11.5.6 | | |
+---------------+----------------+-----------------+----------+----------------+
| | |13.0.0 - 13.1.0 | | |
| |12.0.0 - 12.1.0 |12.1.1 - 12.1.3 | | |
|BIG-IP APM |11.6.0 - 11.6.1 |11.6.1 HF1 - |Low |PCRE library |
| |11.0.0 - 11.5.4 |11.6.3 | | |
| |10.1.0 - 10.2.4 |11.5.4 HF2 - | | |
| | |11.5.6 | | |
+---------------+----------------+-----------------+----------+----------------+
| | |13.0.0 - 13.1.0 | | |
| |12.0.0 - 12.1.0 |12.1.1 - 12.1.3 | | |
|BIG-IP ASM |11.6.0 - 11.6.1 |11.6.1 HF1 - |Medium |PCRE library |
| |11.0.0 - 11.5.4 |11.6.3 | | |
| |10.1.0 - 10.2.4 |11.5.4 HF2 - | | |
| | |11.5.6 | | |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IP DNS |12.0.0 - 12.1.0 |13.0.0 - 13.1.0 |Low |PCRE library |
| | |12.1.1 - 12.1.3 | | |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IP Edge |11.0.0 - 11.3.0 |None |Low |PCRE library |
|Gateway |10.1.0 - 10.2.4 | | | |
+---------------+----------------+-----------------+----------+----------------+
| |11.6.0 - 11.6.1 |11.6.1 HF1 - | | |
|BIG-IP GTM |11.0.0 - 11.5.4 |11.6.3 |Low |PCRE library |
| |10.1.0 - 10.2.4 |11.5.4 HF2 - | | |
| | |11.5.6 | | |
+---------------+----------------+-----------------+----------+----------------+
| | |13.0.0 - 13.1.0 | | |
| |12.0.0 - 12.1.0 |12.1.1 - | | |
|BIG-IP Link |11.6.0 - 11.6.1 |12.1.3 | | |
|Controller |11.0.0 - 11.5.4 |11.6.1 HF1 - |Low |PCRE library |
| |10.1.0 - 10.2.4 |11.6.3 | | |
| | |11.5.4 HF2 - | | |
| | |11.5.6 | | |
+---------------+----------------+-----------------+----------+----------------+
| | |13.0.0 - 13.1.0 | | |
| | |12.1.1 - | | |
| |12.0.0 - 12.1.0 |12.1.3 | | |
|BIG-IP PEM |11.6.0 - 11.6.1 |11.6.1 HF1 - |Low |PCRE library |
| |11.3.0 - 11.5.4 |11.6.3 | | |
| | |11.5.4 HF2 - | | |
| | |11.5.6 | | |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IP PSM |11.0.0 - 11.4.1 |None |Low |PCRE library |
| |10.1.0 - 10.2.4 | | | |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IP |11.0.0 - 11.3.0 |None |Low |PCRE library |
|WebAccelerator |10.1.0 - 10.2.4 | | | |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IP WOM |11.0.0 - 11.3.0 |None |Low |PCRE library |
| |10.1.0 - 10.2.4 | | | |
+---------------+----------------+-----------------+----------+----------------+
|Enterprise |3.0.0 - 3.1.1 |None |Low |PCRE library |
|Manager | | | | |
+---------------+----------------+-----------------+----------+----------------+
|FirePass |None |7.0.0 |Not |None |
| | |6.0.0 - 6.1.0 |vulnerable| |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IQ Cloud |4.0.0 - 4.5.0 |None |Low |PCRE library |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IQ Device |4.2.0 - 4.5.0 |None |Low |PCRE library |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IQ Security|4.0.0 - 4.5.0 |None |Low |PCRE library |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IQ ADC |4.5.0 |None |Low |PCRE library |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IQ | | | | |
|Centralized |4.6.0 |None |Low |PCRE library |
|Management | | | | |
+---------------+----------------+-----------------+----------+----------------+
|BIG-IQ Cloud | | | | |
|and |1.0.0 |None |Low |PCRE library |
|Orchestration | | | | |
+---------------+----------------+-----------------+----------+----------------+
|LineRate |2.5.0 - 2.6.1 |None |Low |PCRE library |
+---------------+----------------+-----------------+----------+----------------+
|F5 WebSafe |None |1.0.0 |Not |None |
| | | |vulnerable| |
+---------------+----------------+-----------------+----------+----------------+
|Traffix SDC |4.0.0 - 4.4.0 |None |Low |PCRE library |
| |3.3.2 - 3.5.1 | | | |
+---------------+----------------+-----------------+----------+----------------+
Security Advisory Recommended Actions
If you are running a version listed in the Versions known to be vulnerable
column, you can eliminate this vulnerability by upgrading to a version listed
in the Versions known to be not vulnerable column. If the table lists only an
older version than what you are currently running, or does not list a
non-vulnerable version, then no upgrade candidate currently exists.
Mitigation for the BIG-IP ASM system
You can turn off the following list of features to mitigate these
vulnerabilities on the BIG-IP ASM system:
o Disable attack signatures that contain PCRE. You can run the following
command in the Advanced shell (bash) on the BIG-IP ASM system to determine
the list of attack signatures that contain PCRE:
Note: Root access to bash is required to run the following command.
mysql -u root -p$(perl -MPassCrypt -nle 'print PassCrypt::decrypt_password
($_)' /var/db/mysqlpw) -e 'select sig_id, sig_name, rule from
PLC.NEGSIG_SIGNATURES where rule like "%pcre%";'
Once you have determined the list of affected attack signatures, you can
disable an attack signature by performing the following procedure:
1. Log in to the BIG-IP ASM Configuration utility.
2. Navigate to Security > Application Security > Attack Signatures.
3. Locate the affected attack signature.
You can use the Advanced Filter option to search for the attack
signature you want.
4. Click the name of the affected signature.
5. Clear the Enabled check box.
6. Click Update.
7. To effect the change to the affected security policy, click Apply
Policy.
8. Repeat steps 3 through 7 for the remaining affected attack signatures.
o If it is enabled, disable the Exception Patterns setting for the BIG-IP ASM
Data Guard feature (it is disabled by default). To disable this setting,
perform the following procedure:
1. Log in to the BIG-IP ASM Configuration utility.
2. Navigate to Security > Application Security > Data Guard.
3. Clear the Exception Patterns setting.
4. Click Save.
o If you have enabled them, disable other BIG-IP ASM features that use PCRE:
Note: The following features are not enabled by default.
- All user input type parameters, for example, decimal, float, phone,
etc.
- Dynamic parameters extraction that uses regular expression.
- Dynamic session in URL and dynamic flows.
Supplemental Information
o K9970: Subscribing to email notifications regarding F5 products
o K4602: Overview of the F5 security vulnerability response policy
o K9957: Creating a custom RSS feed to view new and updated documents
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