GnuPG: Multiple vulnerabilities
Gentoo Linux Security Advisory
||GLSA 200612-03 / gnupg
||December 10, 2006
||December 10, 2006: 02
All supported architectures
GnuPG is vulnerable to a buffer overflow and an erroneous function pointer
dereference that can result in the execution of arbitrary code.
The GNU Privacy Guard, GnuPG, is a free replacement for the PGP suite
of cryptographic software.
Hugh Warrington has reported a boundary error in GnuPG, in the
"ask_outfile_name()" function from openfile.c: the
make_printable_string() function could return a string longer than
expected. Additionally, Tavis Ormandy of the Gentoo Security Team
reported a design error in which a function pointer can be incorrectly
A remote attacker could entice a user to interactively use GnuPG on a
crafted file and trigger the boundary error, which will result in a
buffer overflow. They could also entice a user to process a signed or
encrypted file with gpg or gpgv, possibly called through another
application like a mail client, to trigger the dereference error. Both
of these vulnerabilities would result in the execution of arbitrary
code with the permissions of the user running GnuPG. gpg-agent, gpgsm
and other tools are not affected.
There is no known workaround at this time.
All GnuPG users should upgrade to the latest version:
Code Listing 3.1: Resolution
# emerge --sync
# emerge --ask --oneshot --verbose "=app-crypt/gnupg-1.4*"