SB2016050515 - OpenSUSE Linux update for libopenssl0_9_8

Description

This security bulletin contains information about 5 secuirty vulnerabilities.

1) Information disclosure (CVE-ID: CVE-2016-0702)

The vulnerability allows a local attacker to decrypt data passed via encrypted SSL connection.

The vulnerability exists in the MOD_EXP_CTIME_COPY_FROM_PREBUF() function in crypto/bn/bn_exp.c. The application does not properly consider cache-bank access times during modular exponentiation, which makes it easier for local users to discover RSA keys by running a crafted application on the same Intel Sandy Bridge CPU core as a victim and leveraging cache-bank conflicts.

The vulnerability was dubbed "CacheBleed".

2) Heap overflow (CVE-ID: CVE-2016-2105)

The vulnerability allows a remote user to cause heap overflow on the target system.

The weakness is caused by insufficient input validation. By sending a great deal of input data attackers are able to cause overflow of the EVP_EncodeUpdate() function used for binary data encoding.

Successful exploitation of the vulnerability may result in heap overflow on the vulnerable system.

3) Input validation error (CVE-ID: CVE-2016-2106)

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

Integer overflow in the EVP_EncryptUpdate function in crypto/evp/evp_enc.c in OpenSSL before 1.0.1t and 1.0.2 before 1.0.2h allows remote attackers to cause a denial of service (heap memory corruption) via a large amount of data.

4) Memory corruption (CVE-ID: CVE-2016-2108)

The vulnerability allows a remote user to cause memory corruption on the target system.

The weakness exists due to buffer underflow with an out-of-bounds write in i2c_ASN1_INTEGER. As ASN.1 parser (specifically, d2i_ASN1_TYPE) can misinterpret a large universal tag as a negative zero value, attacker may easily corrupt memory.

Successful exploitation of the vulnerability will allow a malicious user to trigger memory corruption on the vulnerable system.

5) Excessive memory allocation (CVE-ID: CVE-2016-2109)

The vulnerability allows a remote user to cause excessive memory allocation on the target system.

The weakness exists during reading ASN.1 data by d2i_CMS_bio() function. A short invalid encoding leads to distribution of large amounts of memory for excessive resources or exhausting memory.

Successful exploitation of the vulnerability may result in excessive memory allocation.

Remediation

Install update from vendor's website.

References

• https://lists.opensuse.org/opensuse-security-announce/2016-05/msg00018.html