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Boletines de Vulnerabilidades


Ejecución de código con a2ps

Clasificación de la vulnerabilidad

Propiedad Valor
Nivel de Confianza Oficial
Impacto Obtener acceso
Dificultad Avanzado
Requerimientos del atacante Acceso remoto con cuenta

Información sobre el sistema

Propiedad Valor
Fabricant afectat GNU/Linux
Software afectado GNU a2ps 4.13, 4.13b
FreeBSD
Mandrake Linux 9.2
Mandrake Linux 9.2/AMD64
Mandrake Linux 10.0
Mandrake Linux 10.0/AMD64
Mandrake Linux 10.1
Mandrake Linux 10.1/X86_64
Mandrake Linux Corporate Server 2.1
Mandrake Linux Corporate Server 2.1/X86_64

Descripción

La apliación a2ps no valida correctamente los nombres de fichero.

Esta circunstancia podría ser aprovechada por un atacante con cuenta en el sistema para, creando ficheros con nombres especiales dentro de determinados directorios en que la víctima ejecuta a2ps, ejecutar comandos con los privilegios de la víctima.

Solución

Aplique los mecanismos de actualización propios de su sistema, o bien descargue las fuentes del software y compílelas usted mismo.


Actualización de Software

GNU a2ps
Página oficial
http://www.gnu.org/software/a2ps/

FreeBSD
Aplique el parche proporcionado por el fabricante
http://www.freebsd.org/cgi/cvsweb.cgi/~checkout~/ports/print/a2ps-letter/files/patch-select.c?rev=1.1&content-type=text/plain

Mandrake Linux
Mandrake Linux 9.2
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/9.2/RPMS/a2ps-4.13b-5.1.92mdk.i586.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/9.2/RPMS/a2ps-devel-4.13b-5.1.92mdk.i586.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/9.2/RPMS/a2ps-static-devel-4.13b-5.1.92mdk.i586.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/9.2/SRPMS/a2ps-4.13b-5.1.92mdk.src.rpm
Mandrake Linux 9.2/AMD64
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/amd64/9.2/RPMS/a2ps-4.13b-5.1.92mdk.amd64.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/amd64/9.2/RPMS/a2ps-devel-4.13b-5.1.92mdk.amd64.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/amd64/9.2/RPMS/a2ps-static-devel-4.13b-5.1.92mdk.amd64.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/amd64/9.2/SRPMS/a2ps-4.13b-5.1.92mdk.src.rpm
Mandrake Linux 10.0
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/10.0/RPMS/a2ps-4.13b-5.1.100mdk.i586.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/10.0/RPMS/a2ps-devel-4.13b-5.1.100mdk.i586.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/10.0/RPMS/a2ps-static-devel-4.13b-5.1.100mdk.i586.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/10.0/SRPMS/a2ps-4.13b-5.1.100mdk.src.rpm
Mandrake Linux 10.0/AMD64
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/amd64/10.0/RPMS/a2ps-4.13b-5.1.100mdk.amd64.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/amd64/10.0/RPMS/a2ps-devel-4.13b-5.1.100mdk.amd64.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/amd64/10.0/RPMS/a2ps-static-devel-4.13b-5.1.100mdk.amd64.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/amd64/10.0/SRPMS/a2ps-4.13b-5.1.100mdk.src.rpm
Mandrake Linux 10.1
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/10.1/RPMS/a2ps-4.13b-5.1.101mdk.i586.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/10.1/RPMS/a2ps-devel-4.13b-5.1.101mdk.i586.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/10.1/RPMS/a2ps-static-devel-4.13b-5.1.101mdk.i586.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/10.1/SRPMS/a2ps-4.13b-5.1.101mdk.src.rpm
Mandrake Linux 10.1/X86_64
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/x86_64/10.1/RPMS/a2ps-4.13b-5.1.101mdk.x86_64.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/x86_64/10.1/RPMS/a2ps-devel-4.13b-5.1.101mdk.x86_64.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/x86_64/10.1/RPMS/a2ps-static-devel-4.13b-5.1.101mdk.x86_64.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/x86_64/10.1/SRPMS/a2ps-4.13b-5.1.101mdk.src.rpm
Mandrake Linux Corporate Server 2.1
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/corporate/2.1/RPMS/a2ps-4.13-14.1.C21mdk.i586.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/corporate/2.1/RPMS/a2ps-devel-4.13-14.1.C21mdk.i586.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/corporate/2.1/RPMS/a2ps-static-devel-4.13-14.1.C21mdk.i586.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/corporate/2.1/SRPMS/a2ps-4.13-14.1.C21mdk.src.rpm
Mandrake Linux Corporate Server 2.1/X86_64
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/x86_64/corporate/2.1/RPMS/a2ps-4.13-14.1.C21mdk.x86_64.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/x86_64/corporate/2.1/RPMS/a2ps-devel-4.13-14.1.C21mdk.x86_64.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/x86_64/corporate/2.1/RPMS/a2ps-static-devel-4.13-14.1.C21mdk.x86_64.rpm
ftp://ftp.ps.pl/mirrors/Mandrakelinux/official/updates/x86_64/corporate/2.1/SRPMS/a2ps-4.13-14.1.C21mdk.src.rpm

Debian Linux

Debian 3.0 "Woody"
Fuentes
http://security.debian.org/pool/updates/main/a/a2ps/a2ps_4.13b-16woody1.dsc
http://security.debian.org/pool/updates/main/a/a2ps/a2ps_4.13b-16woody1.diff.gz
http://security.debian.org/pool/updates/main/a/a2ps/a2ps_4.13b.orig.tar.gz
Alpha
http://security.debian.org/pool/updates/main/a/a2ps/a2ps_4.13b-16woody1_alpha.deb
ARM
http://security.debian.org/pool/updates/main/a/a2ps/a2ps_4.13b-16woody1_arm.deb
Intel IA-32
http://security.debian.org/pool/updates/main/a/a2ps/a2ps_4.13b-16woody1_i386.deb
Intel IA-64
http://security.debian.org/pool/updates/main/a/a2ps/a2ps_4.13b-16woody1_ia64.deb
HPPA
http://security.debian.org/pool/updates/main/a/a2ps/a2ps_4.13b-16woody1_hppa.deb
Motorola 680x0
http://security.debian.org/pool/updates/main/a/a2ps/a2ps_4.13b-16woody1_m68k.deb
Big endian MIPS
http://security.debian.org/pool/updates/main/a/a2ps/a2ps_4.13b-16woody1_mips.deb
Little endian MIPS
http://security.debian.org/pool/updates/main/a/a2ps/a2ps_4.13b-16woody1_mipsel.deb
PowerPC
http://security.debian.org/pool/updates/main/a/a2ps/a2ps_4.13b-16woody1_powerpc.deb
IBM S/390
http://security.debian.org/pool/updates/main/a/a2ps/a2ps_4.13b-16woody1_s390.deb
Sun Sparc
http://security.debian.org/pool/updates/main/a/a2ps/a2ps_4.13b-16woody1_sparc.deb

Identificadores estándar

Propiedad Valor
CVE CAN-2004-1170
BID 11025

Recursos adicionales

SecuriTeam: a2ps Executing Shell Commands From File Name
http://www.securiteam.com/unixfocus/5MP0N2KDPA.html

Mandrakesoft Security Advisory MDKSA-2004:140
http://www.mandrakesoft.com/security/advisories?name=MDKSA-2004:140

Debian Security Advisory DSA-612
http://www.debian.org/security/2004/dsa-612

Histórico de versiones

Versión Comentario Data
1.0 Aviso emitido 2004-12-01
1.1 Aviso emitido por Debian Linux (DSA 612-1) 2004-12-21
Ministerio de Defensa
CNI
CCN
CCN-CERT