Leptonica before 1.75.3 does not limit the number of characters in a %s format argument to fscanf or sscanf, which allows remote attackers to cause a denial of service (stack-based buffer overflow) or possibly have unspecified other impact via a long string, as demonstrated by the gplotRead and ptaReadStream functions.

The remote host is affected by the vulnerability described in GLSA-202312-01 (Leptonica: Multiple Vulnerabilities)

  - Leptonica 1.74.4 constructs unintended pathnames (containing duplicated path components) when operating on     files in /tmp subdirectories, which might allow local users to bypass intended file restrictions by     leveraging access to a directory located deeper within the /tmp directory tree, as demonstrated by     /tmp/ANY/PATH/ANY/PATH/input.tif. (CVE-2017-18196)

  - Leptonica before 1.75.3 does not limit the number of characters in a %s format argument to fscanf or     sscanf, which allows remote attackers to cause a denial of service (stack-based buffer overflow) or     possibly have unspecified other impact via a long string, as demonstrated by the gplotRead and     ptaReadStream functions. (CVE-2018-7186)

  - An issue was discovered in pixHtmlViewer in prog/htmlviewer.c in Leptonica before 1.75.3. Unsanitized     input (rootname) can overflow a buffer, leading potentially to arbitrary code execution or possibly     unspecified other impact. (CVE-2018-7247)

  - An issue was discovered in Leptonica through 1.75.3. The gplotMakeOutput function allows command injection     via a $(command) approach in the gplot rootname argument. This issue exists because of an incomplete fix     for CVE-2018-3836. (CVE-2018-7440)

  - Leptonica through 1.75.3 uses hardcoded /tmp pathnames, which might allow local users to overwrite     arbitrary files or have unspecified other impact by creating files in advance or winning a race condition,     as demonstrated by /tmp/junk_split_image.ps in prog/splitimage2pdf.c. (CVE-2018-7441)

  - An issue was discovered in Leptonica through 1.75.3. The gplotMakeOutput function does not block '/'     characters in the gplot rootname argument, potentially leading to path traversal and arbitrary file     overwrite. (CVE-2018-7442)

  - An issue in the Leptonica linked library (v1.79.0) allows attackers to cause an arithmetic exception     leading to a Denial of Service (DoS) via a crafted JPEG file. (CVE-2022-38266)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 16.04 ESM host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4819-1 advisory.

    It was discovered that Leptonica incorrectly handled path names. An attacker could possibly use this issue     to obtain sensitive information. This issue only affected Ubuntu 16.04 ESM. (CVE-2017-18196)

    It was discovered that Leptonica incorrectly handled certain input arguments. An attacker could possibly     use this issue to execute arbitrary commands. (CVE-2018-3836)

    It was discovered that Leptonica incorrectly handled input arguments. An attacker could possibly use this     issue to cause a denial of service or other unspecified impact. (CVE-2018-7186)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

This update fixes CVE-2017-18196.

----

This update backports security fixes for CVE-2018-3836, CVE-2018-7186 and CVE-2018-7247.

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

This update for leptonica fixes the following issues :

  - CVE-2018-7247: Fixed a buffer overflow in in     src/viewfiles.c with unsanitized input (rootname)     (boo#1081631)

  - CVE-2018-7186: Fixed multiple stack-based buffer     overflows in gplotRead() and ptaReadStream()     (boo#1081576)

  - CVE-2018-3836: Added additional bad characters, to     prevent command injection by invoking it via $(command)     (boo#1079358)

Different flaws have been found in leptonlib, an image processing library. 

CVE-2018-7186

Leptonica did not limit the number of characters in a %s format argument to fscanf or sscanf, that made it possible to remote attackers to cause a denial of service (stack-based buffer overflow) or possibly have unspecified other impact via a long string.

CVE-2018-7440

The gplotMakeOutput function allowed command injection via a $(command) approach in the gplot rootname argument. This issue existed because of an incomplete fix for CVE-2018-3836.

For Debian 7 'Wheezy', these problems have been fixed in version 1.69-3.1+deb7u2.

We recommend that you upgrade your leptonlib packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
187052	GLSA-202312-01 : Leptonica: Multiple Vulnerabilities	Nessus	Gentoo Local Security Checks	critical
183556	Ubuntu 16.04 ESM : Leptonica vulnerabilities (USN-4819-1)	Nessus	Ubuntu Local Security Checks	critical
108310	Fedora 27 : leptonica / mingw-leptonica (2018-cbf621a53c)	Nessus	Fedora Local Security Checks	critical
108309	Fedora 26 : leptonica / mingw-leptonica (2018-78570112db)	Nessus	Fedora Local Security Checks	critical
107181	openSUSE Security Update : leptonica (openSUSE-2018-226)	Nessus	SuSE Local Security Checks	critical
107152	Debian DLA-1302-1 : leptonlib security update	Nessus	Debian Local Security Checks	critical

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CVE-2018-7186

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