Xpdf, as used in products such as gpdf, kpdf, pdftohtml, poppler, teTeX, CUPS, libextractor, and others, allows attackers to cause a denial of service (infinite loop) via streams that end prematurely, as demonstrated using the (1) CCITTFaxDecode and (2) DCTDecode streams, aka "Infinite CPU spins."

A "stack overwrite" vulnerability in GnuPG (gpg) 1.x before 1.4.6, 2.x before 2.0.2, and 1.9.0 through 1.9.95 allows attackers to execute arbitrary code via crafted OpenPGP packets that cause GnuPG to dereference a function pointer from deallocated stack memory.

Format string vulnerability in GnomeMeeting 1.0.2 and earlier allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via format strings in the name, which is not properly handled in a call to the gnomemeetingloginsert function.

The asn1decodegeneraltime function in lib/krb5/asn.1/asn1decode.c in the ASN.1 GeneralizedTime decoder in MIT Kerberos 5 (aka krb5) before 1.6.4 allows remote attackers to cause a denial of service (daemon crash) or possibly execute arbitrary code via vectors involving an invalid DER encoding that triggers a free of an uninitialized pointer.

gdk-pixbuf through 2.31.1 has GIF loader buffer overflow when initializing decompression tables due to an input validation flaw

A flaw was found in the bash functionality that evaluates specially formatted environment variables passed to it from another environment. An attacker could use this feature to override or bypass restrictions to the environment to execute shell commands before restrictions have been applied. Certain services and applications allow remote unauthenticated attackers to provide environment variables, allowing them to exploit this issue.

Acknowledgements:

Red Hat would like to thank Stephane Chazelas for reporting this issue.

GNU Bash through 4.3 bash43-025 processes trailing strings after certain malformed function definitions in the values of environment variables, which allows remote attackers to write to files or possibly have unknown other impact via a crafted environment, as demonstrated by vectors involving the ForceCommand feature in OpenSSH sshd, the modcgi and modcgid modules in the Apache HTTP Server, scripts executed by unspecified DHCP clients, and other situations in which setting the environment occurs across a privilege boundary from Bash execution. NOTE: this vulnerability exists because of an incomplete fix for CVE-2014-6271.

Integer overflow in Mozilla Thunderbird before 1.5.0.10 and SeaMonkey before 1.0.8 allows remote attackers to trigger a buffer overflow and possibly execute arbitrary code via a text/enhanced or text/richtext e-mail message with an extremely long line.

Jakob Balle and Carsten Eiram of Secunia Research reported a race condition in NPObjWrapperNewResolve when accessing the properties of a NPObject, a wrapped JSObject. Balle and Eiram demonstrated that this condition could be reached by navigating away from a web page during the loading of a Java applet. Under such conditions the Java object would be destroyed but later called into resulting in a free memory read. An attacker could potentially write to the freed memory before it is reused and run arbitrary code on the victim's computer.

Dan Kaminsky pointed out that using partial MD4 and using that to generate a sequence number, of which only 24-bits are truly unguessable, seriously undermine the goals of random sequence number generation.

In particular, with only 24-bits being truly unguessable, packet injection into a session using even something like brute force is a real potential possibility.

We only use 24-bits because we regenerate the random number every 5 minutes "just in case." But what does is trade a "we don't know" kind of theoretical issue for a provably real one (brute force attack).

Therefore [Dave Miller] moving us more in line with RFC1948 (as well as OpenBSD and Solaris), to use MD5 and a full 32-bit result in the generated sequence number.

MD5 was selected as a compromise between performance loss and theoretical ability to be compromised. Willy Tarreau did extensive testing and SHA1 was found to harm performance too much to be considered seriously at this time.

We may later add a sysctl for various modes (ie. a "super secure" mode that uses SHA1 if people want that, and an "insecure" mode that doesn't use cryptographic hashing at all for people in protected environments where that might be safe to do).

[Dave Miller] also moved the sequence number generators out of random.c (they never really belonged there, and are only there due to historical artifacts), and fixed a bug in DCCP sequence number generation (on ipv6 the 43-bit sequence number was truncated to 32-bits).

Acknowledgements:

Red Hat would like to thank Dan Kaminsky for reporting this issue.

Integer signedness error in the CIFSFindNext function in fs/cifs/cifssmb.c in the Linux kernel before 3.1 allows remote CIFS servers to cause a denial of service (memory corruption) or possibly have unspecified other impact via a large length value in a response to a read request for a directory.

Integer overflow in the bdfReadCharacters function in bdfread.c in (1) X.Org libXfont before 20070403 and (2) freetype 2.3.2 and earlier allows remote authenticated users to execute arbitrary code via crafted BDF fonts, which result in a heap overflow.

The SQLDriverConnect() function in unixODBC before 2.2.14p2 have a possible buffer overflow condition when specifying a large value for SAVEFILE parameter in the connection string.

Last updated 24 July 2024

Last updated 24 July 2024

scan.c for LibXPM may allow attackers to execute arbitrary code via a negative bitmapunit value that leads to a buffer overflow.

Multiple buffer overflows in the dissecta11radius function in the CDMA A11 (3G-A11) dissector (packet-3g-a11.c) for Ethereal 0.10.9 and earlier allow remote attackers to execute arbitrary code via RADIUS authentication packets with large length values.

Postfix 2.1.3, when /proc/net/ifinet6 is not available and permitmxbackup is enabled in smtpdrecipientrestrictions, allows remote attackers to bypass e-mail restrictions and perform mail relaying by sending mail to an IPv6 hostname.

sysreport 1.3.15 and earlier includes contents of the up2date file in a report, which leaks the password for a proxy server in plaintext and allows local users to gain privileges.

pamldap in nssldap on Red Hat Enterprise Linux 4, Fedora Core 3 and earlier, and possibly other distributions does not return an error condition when an LDAP directory server responds with a PasswordPolicyResponse control response, which causes the pamauthenticate function to return a success code even if authentication has failed, as originally reported for xscreensaver.

Dirk Mueller reported an off by one buffer overflow flaw in the way QT parses certain unicode strings.

To quote Dirk:

Ive found a off-by-one buffer overflow in QUtf8Decoder::toUnicode(). It is not exploitable with Qt 4.x or above because there is an additional QChar(0) being allocated in QString, however it is still a bug there, as the array returned by utf16() etc is no longer terminated properly.

http://kerneltrap.org/mailarchive/linux-netdev/2010/3/3/6271093/thread "The root cause for this problem is, when the receiver is doing releasesock() (i.e. after userspace recv, kernel udprecvmsg->skbfreedatagramlocked->releasesock), it moves skbs from backlog to skreceivequeue with the softirq enabled. In the above case, multiple busy senders will almost make it an endless loop. The skbs in the backlog end up eat all the system memory.

The issue is not only for UDP. Any protocols using socket backlog is potentially affected. The patch adds limit for socket backlog so that the backlog size cannot be expanded endlessly."

Upstream commits: http://git.kernel.org/linus/2499849ee8f513e795b9f2c19a42d6356e4943a4 http://git.kernel.org/linus/53eecb1be5ae499d399d2923933937a9ea1a284f http://git.kernel.org/linus/50b1a782f845140f4138f14a1ce8a4a6dd0cc82f http://git.kernel.org/linus/79545b681961d7001c1f4c3eb9ffb87bed4485db http://git.kernel.org/linus/55349790d7cbf0d381873a7ece1dcafcffd4aaa9 http://git.kernel.org/linus/6b03a53a5ab7ccf2d5d69f96cf1c739c4d2a8fb9 http://git.kernel.org/linus/8eae939f1400326b06d0c9afe53d2a484a326871 http://git.kernel.org/linus/a3a858ff18a72a8d388e31ab0d98f7e944841a62 http://git.kernel.org/linus/c377411f2494a931ff7facdbb3a6839b1266bcf6

Last updated 24 July 2024

IPv6 fragment identification generation is way beyond what we use for IPv4 : It uses a single generator. Its not scalable and allows DOS attacks.

Now inetpeer is IPv6 aware, we can use it to provide a more secure and scalable frag ident generator (per destination, instead of system wide)

This patch : 1) defines a new secureipv6id() helper 2) extends inetgetid() to provide 32bit results 3) extends ipv6selectident() with a new dest parameter

http://thread.gmane.org/gmane.linux.network/201773

Acknowledgements:

Red Hat would like to thank Fernando Gont for reporting this issue.

Buffer overflow in the polymorphic opcode support in the Regular Expression Engine (regcomp.c) in Perl 5.8 allows context-dependent attackers to execute arbitrary code by switching from byte to Unicode (UTF) characters in a regular expression.

initscripts in Red Hat Enterprise Linux 4 does not properly handle certain environment variables when /sbin/service is executed, which allows local users with sudo permissions for /sbin/service to gain root privileges via unknown vectors.

Unknown vulnerability in the Red Hat Enterprise Linux 4 kernel 4GB/4GB split patch, when using the hugemem kernel, allows local users to read and write to arbitrary kernel memory and gain privileges via certain syscalls.

The bluezsockcreate function in the Bluetooth stack for Linux kernel 2.4.6 through 2.4.30-rc1 and 2.6 through 2.6.11.5 allows local users to gain privileges via (1) socket or (2) socketpair call with a negative protocol value.

Multiple drivers in Linux kernel 2.4.19 and earlier do not properly mark memory with the VMIO flag, which causes incorrect reference counts and may lead to a denial of service (kernel panic) when accessing freed kernel pages.

Unspecified vulnerability in the listxattr system call in Linux kernel, when a "bad inode" is present, allows local users to cause a denial of service (data corruption) and possibly gain privileges via unknown vectors.