Multiple vulnerabilities in libxslt

1) Information disclosure

EUVDB-ID: #VU18966

Risk: Low

CVSSv3.1: 4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:U/RC:C]

CVE-ID: CVE-2019-13118

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to uninitialized stack data exposure in numbers.c in libxslt library when processing an invalid character/length combination in xsltNumberFormatDecimal. A remote attacker can gain pass specially crafted data to the application using the affected library and gain access to sensitive information.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

libxslt: 1.1.33

External links

http://bugs.chromium.org/p/oss-fuzz/issues/detail?id=15069
http://gitlab.gnome.org/GNOME/libxslt/commit/6ce8de69330783977dd14f6569419489875fb71b
http://oss-fuzz.com/testcase-detail/5197371471822848

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Information disclosure

EUVDB-ID: #VU18965

Risk: Low

CVSSv3.1: 2.9 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:U/RC:C]

CVE-ID: CVE-2019-13117

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to information disclosure in numbers.c in libxslt library where an xsl:number with certain format strings could lead to a uninitialized read in xsltNumberFormatInsertNumbers. A remote attacker can gain knowledge whether a byte on the stack contains the characters A, a, I, i, or 0, or any other character.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

libxslt: 1.1.33

External links

http://bugs.chromium.org/p/oss-fuzz/issues/detail?id=14471
http://gitlab.gnome.org/GNOME/libxslt/commit/c5eb6cf3aba0af048596106ed839b4ae17ecbcb1
http://oss-fuzz.com/testcase-detail/5631739747106816

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

3) Buffer overflow

EUVDB-ID: #VU21942

Risk: High

CVSSv3.1: 8.1 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2019-18197

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error within the xsltCopyText() function in transform.c in libxslt. A remote attacker can create a specially crafted XML document, pass it to the affected application, trigger memory corruption and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

libxslt: 1.1.33

External links

http://bugs.chromium.org/p/oss-fuzz/issues/detail?id=15746
http://bugs.chromium.org/p/oss-fuzz/issues/detail?id=15768
http://bugs.chromium.org/p/oss-fuzz/issues/detail?id=15914
http://gitlab.gnome.org/GNOME/libxslt/commit/2232473733b7313d67de8836ea3b29eec6e8e285

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.